{
  "manageEntity": {
    "action": "Save",
    "entityId": "264913525",
    "entityType": "Track",
    "nonce": "0x5f01c86b3bd241ca4ff7f03f54545cbafa121d18d65f489b197727d2db286423",
    "signature": "0x9e7fd4da356946a849f2540cb89eb6becbeac5fa8a9c16619362d6dbfa354c742bd9229346a1e68e123167189b3b49310e6cbd607f49b9957994c66e49485d421c",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}