{
  "manageEntity": {
    "action": "Save",
    "entityId": "907957933",
    "entityType": "Track",
    "nonce": "0xa0c678a7c99cb815fa84e74d44d83012e531ec034a4d36d28c32c6b483882f8e",
    "signature": "0xbb955f2c68404ea0b128734a2256631d0e02738b4c0895ce23d8657dd3568065507c0174760ab50851c18d12a5d178afd4c12bed84d4461582afd9c7e08594301c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}