{
  "manageEntity": {
    "action": "Save",
    "entityId": "1221947327",
    "entityType": "Track",
    "nonce": "0x999d9d644c3a00fbda1ca617a77d3b5ebd2f78fac3a892b73320cbf09d338e1d",
    "signature": "0xfb1d2b19a6795828fba501aa52401a5a42123d450e893a0c13335544ebad73132b9f4e39bf637bdecb1200b7e3de1fbbef7aebf8da401aa7437b7a055d752d391c",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}