{
  "manageEntity": {
    "action": "Save",
    "entityId": "738460232",
    "entityType": "Track",
    "nonce": "0xd22deb168ba52fa4e3fc17ed59d30413255d60c348735e3cb2a816088d38dc39",
    "signature": "0xaff8b09e56902f4aca30bbabc26e09e2717d3ac00c642a35ca10ea62ffd4f9884f974cf6e35178876bf4b2585db6bee5071f8712b15b02fde46657b6e30a11871c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}