{
  "manageEntity": {
    "action": "Save",
    "entityId": "502201871",
    "entityType": "Track",
    "nonce": "0x73647fbdaf3cc60b0d5ca0becf325427ce585f5dd403155aaf621a798009f2d9",
    "signature": "0xf93fc5927fd4727bb313619832d0465e78d0d1d7c9f39f46b0251af68c26504a5c4fff531b4bf5f0b94e9905ac68bf83bea429036dd31e18ab8b2b36340905e11c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}