{
  "manageEntity": {
    "action": "Save",
    "entityId": "476640",
    "entityType": "Track",
    "nonce": "0x3dc94eb342d7a345a3fb5ec7ce62530484c4ccc5e930febd9ea610b6344956c0",
    "signature": "0x8786e5edba032107815592465b561205e40e3ed7ed5ef5a92e62a04e756bbb197c059138ca1e35be10633d14c70bb65d93702f6be87dceb0c27b8c6b7ad79eb11c",
    "signer": "0xdA0eFB0e7b973C487c12501759aDb23012CB5248",
    "userId": "178070"
  }
}