{
  "manageEntity": {
    "action": "Save",
    "entityId": "976698",
    "entityType": "Track",
    "nonce": "0xc0f52ddb65bada902d473d822bfb0f7c0532557e080a11a4409f394c7bd0e6f6",
    "signature": "0xcad409589f6bed5443c68c164e2326aaf47da54054bd4e063aefe9c9a86d3b0754d37f9e0dd0fcf8bdd13246219e35166832e5c3d586727f29af2754030b3d271c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}