{
  "manageEntity": {
    "action": "Save",
    "entityId": "318850505",
    "entityType": "Track",
    "nonce": "0x00945b81cfac172eff7bd5b476c34aca24d32ad443018faa82c718b2a30e6c23",
    "signature": "0x46a465389d840a3ff3a101773acad82fd654c6774932b137e2414e51ca1c82f607ea64b595b0dd79263d287b3172666c6b74a47ebcce4213d21dafd25da312e61b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}