{
  "manageEntity": {
    "action": "Save",
    "entityId": "348638750",
    "entityType": "Track",
    "nonce": "0x8dcca1597c6cdc29d8793429b6f330c1891ba9dc40e688de57da3c687c529936",
    "signature": "0x10298cd7aba943c259cfee7ed3d74d2e58e310ffc0ab2dd500c965ac07e96a89610e7150870df2b240a29fe61e0e2e5405dfe8a783a7b438f10258560d2620d11c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}