{
  "manageEntity": {
    "action": "Save",
    "entityId": "1578996301",
    "entityType": "Track",
    "nonce": "0xb44356ee6d2a28a8cb4968a3f54e50c4848c4c4731134cb579da6b0ce77c219a",
    "signature": "0xa346e5368f40f34b7235ffd96fdcfcac6c3e5b608ab045afe61985502d6561257bce5bd6ecf4e7c9edacaafec8ab84fb0551132fc43986822b9eba05e63fa7bc1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}