{
  "manageEntity": {
    "action": "Save",
    "entityId": "2125986320",
    "entityType": "Track",
    "nonce": "0xbb14e0bc9fb43711ec179cbf5c03b8709588a02494a35715da7a1a4a4328ce57",
    "signature": "0xb403652bde1920476a607edd23b77e538e0ed8871397d78a971b4c01bcf78a602dd09fa163b7afb2e55a9ca4467db21ab0800e069a05fe365499e649f15e52b41c",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}