{
  "manageEntity": {
    "action": "Save",
    "entityId": "289061809",
    "entityType": "Track",
    "nonce": "0xb2fb4f5f8251e3b495cd63e973af6c7aedb80575238ad7aebd62016d559e8c75",
    "signature": "0xa8d6f9b9f07741f6062ddcbeecb3e45f76487fa9305b6b2329b1ae6ec6e6d37676e9a31260455f0857141937beddc9034415ca14379f1d7ca817894ddb7643c41b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}