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 0x7ee2c43407773bbbd4e567c3abe2905a8b7ea8ab153df26ee5aee8c997e92b8e. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fce6d1d8-712b-468c-a10a-33e60152c213.json and https://artists.proofprofile.net/proofs/artist/fce6d1d8-712b-468c-a10a-33e60152c213.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 0x17ab948a62ff38ed9c55db289d39837f4aa58e10aab08a21e93c211a7a97dceb. 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/USL4Q1993366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827253a4a8dd355891904ccbf7d65276ff48c2645624effebe5a85a35e71fc14. 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/US83Z1785972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452a4006390ff5b5f07f8ef81bf62be4dbcd6641e0fd86de33f1d75a2cb3a103. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USL4Q1904221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7d6e1be289a19bf74606472ad3d0285a5045278f5796b6d27d6ae5ce23b37f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USL4Q1904222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f602fd6c1150afd320e414a54c02d87b23aa504549928a1747b172765fdd0e7. 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/USL4Q1904223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8ab62c4b1d59c29355ca8faf3335c5eefcdcd0c86fd2462f116d8f72e04572. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/NOTKM1453010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7784e6e04605105931f425d6ca5e28099066664a347b876898bc24b65f1e68b3. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NOTKM1453020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29b87ea97ec37661d75aaadcb747dd364448bd547b9a6788744f0170fdfb6dc. 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/NOTKM1453030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb0bb0aca267ddf0fdb5c92748aad95680dd8f9e631595e46cffff94f632340. 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/USL4Q2142394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f746493186b2ca96201e9a76a1b490af3cd05d8218e835723cfecc081592279. 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/USHM22138522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4b41ca2e72afdf5d721fe04b5c12441ad97f5c481ce44dec8af21156569a4b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USL4R2029746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a06c67c2298d04df65f8603a6a4696c553ca1ec0b9eadc433b206f041196197. 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/USHM91950136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5d0794a914d2d35eb24c5342b1b7e2414f49817e31bac1057548a500b0abcb. 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/NOTKM1135010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c41774ed1422ee5583c7309b829c9316b22c9025c751255c0a751092071e1a. 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/NOTKM1135020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6423f1dcda220c4a4d494f9fc99a7f73307d45628bd170ed98440eaab62ad79. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NOTKM1135030.