{
  "manageEntity": {
    "action": "Save",
    "entityId": "446419159",
    "entityType": "Track",
    "nonce": "0x3cb471d67c56f30820edfe6fc320c7494ce8031af120edcc011760fb41b7b6d8",
    "signature": "0x4a0df9a5c56516f684679b37aec18f5a881ca89c2e4d87b56a770e72fc6b2b081ba04410ef91a87f923a6dfed3f98f269de0927131ac520c4c95bcb16cfbeb6e1b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}