{
  "manageEntity": {
    "action": "Save",
    "entityId": "129948",
    "entityType": "Track",
    "nonce": "0x21fd03d393cab54d231c8abd7649ac4e0a06407c6c0fcf1602d8d3ed6ba423f7",
    "signature": "0x8c1f6832ac14052422259bd1db2dfeee252fb96bc91ac13f1b48bdd729cbeaa254e4e3d62a71ce68f277975e09be640ae9a1245aced2e1db5157d4139e53ce4c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}