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 0x743b55658f59fb7a6fb3697d83cbfa5485cb297e9efadf634870617e2f990860. 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/daa375fa-47dd-4a8c-af04-b10e6d71bc4a.json and https://artists.proofprofile.net/proofs/artist/daa375fa-47dd-4a8c-af04-b10e6d71bc4a.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 0x3cef0dd3051f87ecd2c45fc7fbed3cb0650290aaf99c882d0ab9a6f0f2324a55. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDE2413614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b1af96c5837a731b23be4eb5ec57fe7030e3f60edc3de70481f976350c5b46. 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/QZTV32327899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9bfa5aa91831550cff6d4919690cdfb8d2d1544f0c286c1236746760de560b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKEHX2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5d5d3cf31ac8ea56b85805a6d04aa2a7ceb99e64e7fc4de9563f0530bb11f7. 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/BXIV82413253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e690ef010e4635db7bc1aea45b1b7021a6b1807591d93b1962534d3dba88e9. 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/BCRK02400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3f75a7f85374218862e1508ed3073c13c39c704a22c552ad3c46d43b71b409. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKRQM2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972f9be1fc6e716731e1a053af4d5b06342f2060919c1a68bc212aba640de72e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKRQM2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7f17dcbf0f8d616f5f0d32de6763c8daca1d1cce740e013f11d76ec696252b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWDD2239449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ae6c42d5ef8199fe2d7f19e91f082324aa611db5463b17d7ca87242475cda4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCRK02500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x416e1f13a4f833bb13be208717968a9db1f6533be8467c9c30e8adb58e1be4c9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRWMB2500033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831f92f4b3e6d3ee8bbff8ccf6a81f026c91d634b2393f656c557750bc51f8ae. 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/BXZYA2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d6bc8cc909c44a6c6827af0ba946a47fd7d22e3837ef5e8451f68855c93095. 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/QZWDE2507203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3f75a7f85374218862e1508ed3073c13c39c704a22c552ad3c46d43b71b409. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKRQM2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb32805751c71fb59a0edaf55046df0adae8f504f1017a11008ba68b580c49a6. 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/BC1WJ2500004.