{
  "manageEntity": {
    "action": "Save",
    "entityId": "688811946",
    "entityType": "Track",
    "nonce": "0x4cd86de94b25cd1b001147a32bd4de8bd04984c8855922a4fbbc4c888ef52fa2",
    "signature": "0x2d37e6f8645bff3cb87b8c5535170ac6f32501ec8d70f83727d272c79c293b4374af8e787db29e375b995374389c6db9124baecd015ea3f2a5270c56c04050b71b",
    "signer": "0x19EDB4c1a8740c323f6e57B80F3422C01875289e",
    "userId": "390804"
  }
}