{
  "manageEntity": {
    "action": "Save",
    "entityId": "721889343",
    "entityType": "Track",
    "nonce": "0x53fde2673e2cc000d6fc10762f66bff344d09a4af1d5360d6292e140f4e04a32",
    "signature": "0x4e768b0cbb8e68af1bc85365b01a8fa704f679271eab59c89a2fe01460a587842b3d563e1f1123fb7d721d129ae737380b69b30a45a27f761a2783b0473b125d1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}