{
  "manageEntity": {
    "action": "Save",
    "entityId": "621737",
    "entityType": "Track",
    "nonce": "0x2093f81979cfca3e04e17b685073e0f67f886f06a4e76c9f53c12b8f4c2523fa",
    "signature": "0x0dfe3408fe96cf968552ecb7cd071947c781655d4fcf368c50e11df98d2584874b8c9e05b545186c52c2c6e4d680c28246e15a9e8f2b0368ea252fa6565a22ad1b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}