{
  "manageEntity": {
    "action": "Save",
    "entityId": "677373",
    "entityType": "Track",
    "nonce": "0x3aec0f8157ff4075df0260eb2243b24dae3e55ddf6d666214e8ade150851c5fa",
    "signature": "0x8fc0e4bbed06afa2e10d4efa3a179256beae6c88913f73fbb5e8032693283dea556b5317e1374e21d1e2958d299278335e743ad78e57747b3b04acb0fdf072441b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}