{
  "manageEntity": {
    "action": "Save",
    "entityId": "542622419",
    "entityType": "Track",
    "nonce": "0x64d7886a49345d5cff6cd9ce243b93fc6aa0ec729f7eaa84f864eecdffb46a73",
    "signature": "0x8948b6b1a76fb3f127fa1a4a92b85eacd350362f603b875cb9ca288a1f26a888369b68def6a89c02cf146d533a26562c4f7e5dc9c3b858cebd00c9cf380fd4641b",
    "signer": "0x8744caeb34331041C87dD6CAbceC29703c546e5a",
    "userId": "198548249"
  }
}