{
  "manageEntity": {
    "action": "Save",
    "entityId": "659742809",
    "entityType": "Track",
    "nonce": "0xc153318aff3233e9593102aaa47243925edf7aad30a890ef31b16177dc5a4faa",
    "signature": "0x2b18be9bfa227603ed51a77daac42166579992237a16aef34eae3c0fa9be4b5e627c6d99b8d3a1c1a19f015937f2f0ba1220105466a4cc17f00c4ce62f320cde1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}