{
  "manageEntity": {
    "action": "Save",
    "entityId": "964644",
    "entityType": "Track",
    "nonce": "0xe685b405f550e46fa431fac3f9d0f1a34da312266d56d970b1a69e50cc976de6",
    "signature": "0xd68d437a20a54196c0cfdac642b4c36331e1c0eed7472f7189a4cc02d3c636fb6d2e9526b6e03c973de4cb2dba65b9dcab0ec0c313e28b3fe86dc6d760dd01c31c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}