{
  "manageEntity": {
    "action": "Save",
    "entityId": "280573035",
    "entityType": "Track",
    "nonce": "0x90d0bfcd7394caca847c65488e544ad34efb0582b40f989ce916cf04cf1f5aac",
    "signature": "0x277a581656e8d42ad75988b56fddaa5979a18a67c93b507bc59fe56335c293cc6c51979a28b99e425f752cecd392155d7f227be6e0790a87c5ca9ab877898e6b1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}