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 0x4b7e80dfbd5bfa6a7aad92872c138a1c6e44fb840b49b2ff68fad325a4a806be. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f0a27e0-f405-4cc3-83ea-10b6c86c27c3.json and https://artists.proofprofile.net/proofs/artist/6f0a27e0-f405-4cc3-83ea-10b6c86c27c3.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 0x2685f48c876445010efcd09015ae0d7e260e36e3d5c490ff34fcf369ecfde282. 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/TCAGW2349226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4494934ac3b3a0125cb5b40686aaa3ff036b9f3716abc7b352b9367c75f4bfe9. 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/TCAGT2306529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee4a40827f68596a03fae95e0a43391b7436e61081a48ac454712e582498f6f. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/TCAGT2306538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc48a3f9633df06020862a73eb197c81b7cb9bd61a589b9e44b257035f20ecf2. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/TCAGT2306521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a48b9fbd3f2dbaed97923581ee201b40f44d4e43ab8d54e118779d3a7e38164. 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/TCAIO2485676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8833f94f1f4f7f3d2f372f997b0140bc6a6edad0643329ce7841c17b55407e8. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCAGQ2201599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3890cf77d7c5014c68ad8558ee45c215569b722596fe647f028e01792939c720. 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/TCAGQ2201605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59874aa1e1bd533eb9a9497486d94470dad92fd0628f9a1706d3d9e36843acf7. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCAGK2218560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc385a044428f25e98f13ea8f923c4f21fb22e258166ef57f5c682255dab80ff. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCAGJ2293850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1848be07d355c62868cc2ba874c83d0614188cee87aba64a98f8d4938c603ca9. 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/CA5KR2177322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f58ee06966597217da9e02e23491df3b4c1ec3faa89ef96964bddd3c4b811c. 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/CA5KR2032165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf98db6490a6c8f04e6b6c49adf7bc0d2deb61703fc140681b8937d188dc326a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/CA5KR1976871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33129105c181798e2945e585f4f719896350c7178d55b0cfc62b8b0441cf17e9. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/CA5KR1976872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efbd48bbc37102a1112fea077543278d46090d0cc79d3729462107bd0ce86ef. 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/NLZ8V1800180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154d2a35d5606be9b01a40536ec247416a9d54743145efafc2e44db375efedbb. 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/CA5KR1945235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d55e04290748c560acdba942a32d07f82794b5cb9f6b8636c43d6655719dadf. 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/NLS6R1874028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ba9517129e053201a707afbcf0d125dd18746e0248cddaa4ab0b21f6f10ab4. 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/CA5KR2068270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297ff689c2932d028bdad1368e86d4779e53d7cf6c7486fee9380a7a20e03732. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CA5KR2068271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe65a9f7c19043bc6787b87d3852c5bd45eb0b8bde3b7b5fe2752538ceda926c1. 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/CA5KR2068272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553a0eead3d957b37cec215c131592c4b968af12a317846e71e18db7558d8184. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CA5KR1832473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfaa7c3d3952cd73da96afe95dd6d0cfe9a47199e2ada19c5528ec769242f43f. 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/CA5KR1832474.