{
  "manageEntity": {
    "action": "Save",
    "entityId": "1543990327",
    "entityType": "Track",
    "nonce": "0x8da613e9fed20aa7cd5e466fa961b4f05428ee583c4c72f972b0956d8a258c0f",
    "signature": "0x50bae3d8cda502e6a9314324b594e6323fed20261d189a14de0a78a2dfd7cc4c49f5245b60dcd365c9b4b8b6be4994fab0b3ecbdbe3f10355dc1e240d43fc5ba1c",
    "signer": "0xb1B522e4c290853bC2ABb1D802d311A7EB1e696B",
    "userId": "94334210"
  }
}