{
  "manageEntity": {
    "action": "Save",
    "entityId": "1048712",
    "entityType": "Track",
    "nonce": "0x573d0247dcd2f393002d691fc32bf42971b14d1bde3c6a00bd713257c845d8a0",
    "signature": "0x9239e0ccec64aa6b04a4effbd72cefd669f691aeaa6fd7484896e121b44d966c68bc38f9d1afadd0bda03312d9606f4513306487fc925324eb100326e47cdd7e1b",
    "signer": "0x354f479338B7F1593E5Ed2Bdb91a09c4bD12996C",
    "userId": "381478870"
  }
}