{
  "manageEntity": {
    "action": "Save",
    "entityId": "1450727891",
    "entityType": "Track",
    "nonce": "0xeed221795aecb0e1b685fd57b0afb0d8bd6352e55333ce6e03c2ea166e6f01c9",
    "signature": "0xb1b7119e4d2dbc185d2a9caa080b18bbb8d1b76e28ba1afa27d62d02d9f2c31725603d931e16fe244f84f5ff0d5021296788cf446fe1bb65bd2533d7838f24881b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}