{
  "manageEntity": {
    "action": "Save",
    "entityId": "1222413148",
    "entityType": "Track",
    "nonce": "0x626195d505b2fabaee658c8cb03e1505378b530d62827db0c1aa9b13823225c0",
    "signature": "0x6469dfc8ec96f3737ddecee9e114657b0d6cc51b9c78fd322217f3e8d9ca55a72e4a064ed8da3a9c52a64d2c467ff3f17fc6265c4210b37c35ddc3b63c3c43501c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}