{
  "manageEntity": {
    "action": "Save",
    "entityId": "645112566",
    "entityType": "Track",
    "nonce": "0x481a2b441a7e65a4c50f837e024610b8b2b41261dac47eff451568288c33cd64",
    "signature": "0x1ede611dd8b7b45201a653a28a74c2a902834807c23685a6bc2bf2e1d36ce75c31308de8ef3ea9fcb7c73bfa0b9a7b1876bcfb9838b2480eae0aaf8f728d38581b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}