{
  "manageEntity": {
    "action": "Save",
    "entityId": "1516874291",
    "entityType": "Track",
    "nonce": "0x174fda6f2de52b8aa97f535fdb3130bc721d6190036dfd4804d3c32bfca5cbf2",
    "signature": "0x3cb84296175408449719b89edda901a1f7a702f6c5bec276590f575057792d7244479c62e5a9648c0f64876215b937cd5e574c72f7abeb334e4177e2f728316e1b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}