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 0x4c0a92903a668d896d12a7a33e322d0a02f822bc6f73b05c763912881b8fe0c6. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/378317a6-8efa-4922-9a3a-1254e716846a.json and https://artists.proofprofile.net/proofs/artist/378317a6-8efa-4922-9a3a-1254e716846a.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 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 0x4707beaf45fe8f7cec04f4ec0437226efdb596d4c7e95439875fc504cf684717. 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/BXYEU2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9bd75612eae647e1bba8e9d1469af0c408a94479bfdc9910e75a30bbecfeb5. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BXYEU2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77201dd966a645fc24250ebe2ae1a236d01d705d723c54e6ba428aa69e17fb3c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXTQF2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaef2677447b3926a62620f6827d017d75247534c91586082d6655ef5201b433. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXTQF2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0962ce094bf2f42b0dec181e5fd48c19c62eea0f8a5457ab5e5d576b74546a31. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BCN412300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c024aa0978935ca426c27272d414a31f58f646f5304d54df4fceda1366e72ad. 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/BXTQF2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678a30da6a7693fa84911b8a6a4bebfc61ed1f182be7a354d6db60dcec4e11dc. 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/BXTQF2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab01ad0360e9171a1568d5c0ee169c5d0c163352d87b0fe59de9cc3c48d9acf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BXTQF2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8454fec30b3567ce84f3f93269da87272582d345225f2fa8d815c29ccebcc5. 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/BXTQF2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x428827db206bdafd6e95aae4662ac9b3353473f1b987e3956bb2fca074f2516d. 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/BXTQF2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad5ce0c0f9e20d25fb6e8faf985abafadb4da3c3204cb8cbbd1f27649810a24. 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/BXTQF2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebab11e9e181b086b5225fae07ca62389b72d4c7d85f2285d9ec4bfa5a56058. 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/BXTQF2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d469090ae7ab0d1f9f7748cbef651eb137eb6eecf074698576869a10538099. 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/BXTQF2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77201dd966a645fc24250ebe2ae1a236d01d705d723c54e6ba428aa69e17fb3c. 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/BXTQF2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaef2677447b3926a62620f6827d017d75247534c91586082d6655ef5201b433. 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/BXTQF2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0962ce094bf2f42b0dec181e5fd48c19c62eea0f8a5457ab5e5d576b74546a31. 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/BCN412300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c024aa0978935ca426c27272d414a31f58f646f5304d54df4fceda1366e72ad. 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/BXTQF2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678a30da6a7693fa84911b8a6a4bebfc61ed1f182be7a354d6db60dcec4e11dc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/BXTQF2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab01ad0360e9171a1568d5c0ee169c5d0c163352d87b0fe59de9cc3c48d9acf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXTQF2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8454fec30b3567ce84f3f93269da87272582d345225f2fa8d815c29ccebcc5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXTQF2300007.