{
  "manageEntity": {
    "action": "Save",
    "entityId": "519984331",
    "entityType": "Track",
    "nonce": "0xe3a5e4648a461a9332133dbd0b79a91496e64b0bc446f35ee3808afb7e394dd7",
    "signature": "0x6a7b41314ebe7b44c3ae8f05efe9ab80a854fd56c8bbb289745a54199b94a0a810f2607c0525b3d45fe8cfd98f5563c7f3352199867dce81de6c9a62be94e8541b",
    "signer": "0xd14727622fa26ECD6Ad72cADB6b96823f5fb65DD",
    "userId": "173494086"
  }
}