{
  "manageEntity": {
    "action": "Save",
    "entityId": "659661537",
    "entityType": "Track",
    "nonce": "0x4b808e18269868307a76e13aafdcbf1834eb001a40ec40736c4466798164fc13",
    "signature": "0xc319e4f05a5243ba7b355547dee551d79e5026b638413dc925235a962194749d798d2a212dc8788d023f418245da8c66e704442b4a429a34290da9ef34f0af371c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}