{
  "manageEntity": {
    "action": "Save",
    "entityId": "878046760",
    "entityType": "Track",
    "nonce": "0x882cbead3172d067a84be853c1a8ea6660e7c13a8777ae2b466053a230e1c2fe",
    "signature": "0xa63b885d5116e3aa505bc72daa97730ee02c17e9e68c7d099a7a3bdfd16b87f81615eb3702b8f8db16e653871a4781984829d4d15aee63160c61164fe54e56081b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}