thumb|OK Hotel building 2008 thumb|OK Hotel in 1997 The OK Hotel was an American bar and music venue located at 212 Alaskan Way South in Seattle's Pioneer Square district. It is now a location of low
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304999cc060200abc2e3e00798e8eeea5ee8748ca2b90c1c7e058709927f474d. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/899d551a-843f-4478-ae3c-e07086e41ed7.json and https://artists.proofprofile.net/proofs/artist/899d551a-843f-4478-ae3c-e07086e41ed7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55fb459e53953ad2d57f00461257a64c71dcb7cf2d2bc43499d3c7eb861c0d1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUBEC2301593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d72559ffdd4b8cea7f1824edc1ba997bb56630c3031f68dd1959488777c2e2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/AUBEC2311536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9853239ba241571d2ef2b1ff41b37913523df134cc9ee0fcaf18ea7ccc0001. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/AUBEC2317854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a040112275d483748f70863ad9a86a29e1eacfae8e26505a275cc0114b51df8. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/AUBEC2311842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b137c6d675500b1714908cf024ac8cd0077a4fe975e1d2e77e2ac5154003fc. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/AUBEC2317856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a040112275d483748f70863ad9a86a29e1eacfae8e26505a275cc0114b51df8. 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/AUBEC2311842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d72559ffdd4b8cea7f1824edc1ba997bb56630c3031f68dd1959488777c2e2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/AUBEC2311536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d72559ffdd4b8cea7f1824edc1ba997bb56630c3031f68dd1959488777c2e2. 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/AUBEC2311536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55fb459e53953ad2d57f00461257a64c71dcb7cf2d2bc43499d3c7eb861c0d1. 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/AUBEC2301593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbcdda757ac887629ebf97cb0717fc8ad485ab02a6cdff1933bb5ec9bcd5db9. 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/AUBEC2301070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7f444f78d7e3954a6b564319553f4fce78ab174958d47d1fa77f4e1aec0481. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/AUBEC2301071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55901c4dfd94d2b03dca62c96cb07184b3188c2a1589633fda7d3b7e875bf9d9. 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/AUMEV2024661.