{
  "manageEntity": {
    "action": "Save",
    "entityId": "1304965888",
    "entityType": "Track",
    "nonce": "0x59bd840b99d76ded532b4c6fb3a2ca8f392f5f0a2eedfccd1ca2d11bd5373f70",
    "signature": "0xc0adf2b46251e54ae7c4506064d0518055f702a7c8bceaf5eec17c083b18718e1a836d08b8343706839c11e4cf6d6eafee7e10864b4d1b2bf158ea721bde73d71b",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}