{
  "manageEntity": {
    "action": "Save",
    "entityId": "708707",
    "entityType": "Track",
    "nonce": "0x6dc82115316cb023494cc730bd0594eb013789ec0b77532f13585d634adb9c52",
    "signature": "0xa8878d2d56327e0a6e8231c9fb91517718c3a28f40bd797a1aa1f6823888f31876370459241cde7d5efa4c85190f606c952e7d27ebc9d8f461418e3eae9325841b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}