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 0x5bf8eaf4908f9ce39cd74ef234b7e82e14f1837f8e743199ff56e1d253defde9. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dbdaa135-f913-4a1a-b5d8-6cc597c4abc7.json and https://artists.proofprofile.net/proofs/artist/dbdaa135-f913-4a1a-b5d8-6cc597c4abc7.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 0xca2e73647af914fd0ec6239aeded74239905e77289c7e2ea93c184e3dbfccb27. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/SE6SA2266834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77f410dc465157bcc5c1da7de66cae4489cb5ec8080d9392fabc669f2697691. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/SE6SA2266835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3455cb51ec2cbfbc14cb9e7944ab9e514714f5dfd562e15ca155e2c278a96a68. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SE6SA2266836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe769c5ab14c2700b873552f9a30da250e3368ee498fe4faa49e61a470930ec9. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/SE6SA2266837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2e4eb64470bb0db9e13b6b9100ec27aeade6d0d923934f5091d4754c7a6404. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/SE6SA2266838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38531af53326f5c91a93889cb05cc4888138128cd65187670e05fd0dbeed4dda. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/SE6SA2266839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7947ce12d86ec49dac02c4d36542de1ccd29b50bae74f97ac1f7e8e8770c48e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE6SA2266840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7314f62cc760c725c6006b916dc157ea79f9ad3760db46091a3e311136c40faf. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6SA2266841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227ef72c0395b54633c9bd58d47ef12e7db640c67114dcc46b95d46247328a0a. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/SE6SA2266842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01b7c17919e6506f46e370bc211f27fe499ad9463e84e195c2aa01fb3dff7b7. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/SE6SA2266843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb66fab0f4ba1f2fac888f005281f29e31f156c4599fe4d97210d1da51e1982. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/SE6SA2266844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2d0647fb2abc88bfa022b93b44b0dc2c9265f88a17026308fb0d352aeff34b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SE6SA2266845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe909f84135f12c2dbf205355a7098e5b110f29fbd8b7d148de76a06dcf0c7376. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE6SA2394422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfca2612629df71b23da5c9fbfd69f552a87a72cc070d50a037e50c79b9f80e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE6SA2376606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dd9fcf34aea477bcc9a7f0a33f46d55d6980f9233858493eba590689fc7928. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SE6TI2337366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650a10daec960ed27580d62492418708e3453044f5de8231132c9616b44385df. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SE6TI2386672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542e2dc1ac108e742f35bb226187f1e638ec1f4dfbd56eb1e2b48056e81b0cf4. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/SE6TI2349136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f18af1e1531ea6ca153aec7ad825155f3bf557cf108d9471e4debbaf24beab. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/SE6A92315540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191f6d1660d0faace8377eed88913071e56426c944b885240a9b2b56866806c7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SE5752403981.