{
  "manageEntity": {
    "action": "Save",
    "entityId": "720718495",
    "entityType": "Track",
    "nonce": "0xf2678e98455b14e91e3fc1c2d55eff2bba6f9fbad5a4cee624eb92d94b05a1b2",
    "signature": "0x9406b7c141d17bb771f25ceb748f7e083a7fe56b928e3b2f7e09831d4119d33a3ac128e3331217628c14c52f4f439aeead2525961234f2828711d2a6179416001b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}