{
  "manageEntity": {
    "action": "Save",
    "entityId": "542122036",
    "entityType": "Track",
    "nonce": "0xc99c74b6d13d703552358ec80105821a38f52be248576b7caf28da7e805638fc",
    "signature": "0xc7e67439931448cb1387aa1b0b96c8d42a67d036e3facf99c2e1528e61e7f79124d3433fab154ccff0f685cd19da42db408bf430b789c4e9554e3c60025fd7811c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}