{
  "manageEntity": {
    "action": "Save",
    "entityId": "655130",
    "entityType": "Track",
    "nonce": "0x7f99dc5714b0d7ba99f5625d5b2959f285dbacda9ac93d9eb0c806d0789c241f",
    "signature": "0x56e621b16e2c4d10dc8b925bea3de235e697e824ff1fc075762e88963a4b934555fd26659ad54757a6159e4def5505bf3a1c3ed2097dfd51c84f01874c86fa021b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}