{
  "manageEntity": {
    "action": "Save",
    "entityId": "1371354674",
    "entityType": "Track",
    "nonce": "0x7fb31a084edb9d09eacf33b3d067c0d2aa1eba9bb8fd2e8c76c63244c78d3674",
    "signature": "0x4542d9565bb69257913462503c22bc5a14c5dd75043e9085f30ed485695aaf3c3a6a4784ba9766b70ecfcce88858deda216ad9017899144f8f156c0cc9c3ee231c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}