David Wilczewski (June 9, 1952, in Boston – August 22, 2009, in Stockholm) was an American jazz saxophonist. Wilczewski took up clarinet as a child before switching to saxophone as a teenager. He att
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fadff3f89ba7d0a49f5055ef457d38131f92aeb596993e756d800257315586. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc4e46cc-22c6-43be-a3d1-58590fca150a.json and https://artists.proofprofile.net/proofs/artist/fc4e46cc-22c6-43be-a3d1-58590fca150a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
I Don't Know Betty… But I Think You Can Dance To It
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9edcfd5981f04bb6707592d4f59e77c6625fea343f9be8e720ee036cefa05a3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPVA0100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98177d6917e87ee85208dbe262d9e61ce42fce6bf0c0962bb4087dfaca689191. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPVA0100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b2880c432b12cd1e037cddd3567f9fc3ce5d8ef5d48cbdb3148b4ccd60a386. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPVA0100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f25489f9768e3b6173bb16ec866603981b4f001f3f54ce0d0db4b5010452b1a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPVA0100211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1494a826b5f314dbc7995e57c5607f7e638f99498db6e8ad2d978970e6b8b9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPVA0100213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f38693f5979b051f4806e432681aa94a61b0bce6e49edc4cc31872bf3e6a3d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349d9b1b6394f730ba2547e2b791a36c8e80f55db72cb198aa4ed8f9245bbed5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659b1574754ee11320ec02be8e4c5d00392050e210c12c07b02acda579fceb14. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5483a94c87cf0d488f2ebca11e967be0cc40817c54b0e6d7f5ba0a634b8c1f5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVAP0100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7972481529e4b36ed373b705310e533645afebf03b2a1d9c3836602c4f714cd. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1aa39a648af9ada14dfc5b469216d5a23f2e146adb6758c922d9897a3ec310. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd501ad576aa817627414be25d59ec7870fdc9a978b6debd07a5f8f916643732c. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea1c505f9a45f5495be3391b594f3013e693c82fdd681a60f070f405ea31e91. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a0a8d12c5b99671f346100bd404cc0aa9322d9e93b981b533295701422747f. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8218b933be8ba82d147d3a172b740c9349fa3628ae5ff6010434da891823f127. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ede7acbf8d53add910727fbf091e92100c3f9899039eea3d1ad593be721f95b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6f0ed31fc2a840165584cd9f5b0e831f8692a0a7b049e1578169b74548cc89. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA5003413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e6bbedb6e91fd81da621ffd37010b2481e7cbcb96113c3044f03b1537825a5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA8908010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d52b6bf87c5879aa19032b6e741065547847573ddc30f398ee9207f9f5a6c94. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA8908020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b16a235121c55797f75d607a23966531a58f557244c11f1b61c36cb0618d35. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA8908030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad641527aa4d90ff257d1d52d2fdcc0a1bd19fe0c162e169b2f8d83f8095f0de. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA8908040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013e350c874fdfbbc0a1921170c2e2dc772891a6164c48f58035e6a05aee7872. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA8908070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f7b8f06c887f0c5829b8995ad64c995cbb9213366b2ae802c9487820009164. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA8908090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71ad28308e9154c0b358e3830c39cfec3bc7407ea43291f30a303381e58cf5e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA0200805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4892b0ee7fea7c96b55ed037166849baf0059118c99a01018a2f9d0426a138. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVPA0200910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1fe513703f8fbb91a635e24695ef9fb116729f0fa1e8d4e4f15bf22bc5098b. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SERFA9301140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf696c78e45029fb5bd56f9049acf98535c654bbbe895a6462b53c874fa9fc0b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA9304100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e37244962b510e26c3e8c5f968c18555266564d7d8391b1622c5059cbb950b. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA9304150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8001a811f1f443ea2f50e69a374432549600e1a676d7012fa5dabe25b1ebc9b1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA9304230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ba6df0b574100cf769f1a21aa9ede8eeb16060cb1c14065c383cb225ae6fa1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEPXS0701020.