{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549057913",
    "entityType": "Track",
    "nonce": "0xd484699ec36a1ee059ed24643140b38c25ac95af20e7ea3046f8ac739c6504a2",
    "signature": "0x540aacd1d48d25d48a82082ad9573e68152ff5b49b499f0e299f715d5bb6148e1d0095357e119bc471ff7faa8eeb3170f471efa90c089b618b3721005fe05d5e1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}