{
  "manageEntity": {
    "action": "Save",
    "entityId": "129593052",
    "entityType": "Track",
    "nonce": "0x6e8a2e6f016bda039ffbe5e8f06fab9b5cdbcb2664965bb12f46d49acdb1e203",
    "signature": "0x05ca907425729423f89a3e8456aec8bbe4b1cf979348a714941f3442a4e37389482d8e6abcd3a0d17e185c8c883d3ab5f803681d4076f34318ba665a6786acb91c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}