{
  "manageEntity": {
    "action": "Save",
    "entityId": "752968",
    "entityType": "Track",
    "nonce": "0x2fa7cc24066dfa3a5f99de830768e486edf952513e56e79e4fae9115de2daf03",
    "signature": "0xfeb65d79393076bd8160911b6f07094cb380303f3f8e755c02a145bbd4c7c263637a3ab99181541e211d066fe2821198f918e646d2a809de307ead637c00f4d21b",
    "signer": "0x4E3828bc809fb5B9deb81fa536cF73Dd5bF4eeB2",
    "userId": "185184169"
  }
}