{
  "manageEntity": {
    "action": "Save",
    "entityId": "1506096475",
    "entityType": "Track",
    "nonce": "0x914087deeaf0218b2a779b350abb49b7b7330a9256e8561af1badea3f364ce1c",
    "signature": "0x4dc2ba6322a3ccd1ece347d09d92bfbab6391f6834d3ce13a7ac7e27da7c737f6d16f4a3d3bd54ec9f1f0769a1bbaa31bb8009e5f9819f0f3e3a39119b5205051c",
    "signer": "0xc03cf24b1C519dA6a18B6509c7F5C57d01620755",
    "userId": "870665506"
  }
}