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 0x28a709c5c6ec643072a03d2a9359ff5495d6b39f0a5117622d27cadf60b6897d. 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/5f09fef6-48d2-4e52-ab1a-da13696fe87b.json and https://artists.proofprofile.net/proofs/artist/5f09fef6-48d2-4e52-ab1a-da13696fe87b.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 0x61062e592f87cc0496e942a42e314a095046b1e00bb0721d537cc1c491f2820e. 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/NLS762300596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be8f2da2e2715e56be3a98d5b366f49c242fde6a970408c43433b1861e79951. 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/NL4VT2100198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83805db3b4a89d80a1cd3e3c4078102a114a5645b8569b9aec37c5241f07a41c. 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/NLS762200322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee203bfa885a880c263cf5e689870910738cf0f86e72a2e81a89a54af08c278. 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/NLS762100260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca976f84d8ebc4b2443088e781e082cb17d58264caec4a6260846b553449f73e. 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/NLS762400275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa238f2d0adc2bfce43c47a47fb1c9e6fcaf2f51be5c031dcb7e16a2caa1891. 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/NLS762400186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b30590f0fb1002468b5282e0a72a902f695d1e1f497c04aa95fb76f3e4d041e. 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/NLH2L2400155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b51f19edea1e37afaf3d5b501aba420de48d4953c55d46df6ede4c52d768344. 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/NLH2L2300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66fe00f9e7ea57ac390f9a470afb59259ff594c6cd7d31a6c6578091d9d1e4a2. 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/NLS762200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd736ad419af80b19e8ad31cb06fca74ac6b26f98c87fa30710fd916a273171db. 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/NLS762000285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb38a426b519daf977ed346d572a50c6cbeddc3ce94a171f412186a68be228adc. 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/NLS761901385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb309c2908ddb2e8f7a5135d301516e351bdcce347bd88989a5bc8a20dc33051a. 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/NLS761900715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd200132de11ead0765b709fee3b3886bc171bccd01e9583c57532e0811b6ab1c. 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/NLE801900572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1396cee246eecb848c92dfb5ba4a6d8c6ac7957005e645d3a5df5faefa6b19. 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/NLS761900638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ace6e8ffa556e49d6eb7d04922285f1cc5a345f79f44cf1fdce9ee2e10fa0e1. 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/NLS762500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df5dd95a405522118353c4755a4f667e30cafe8c54fa4bcc69a676cf663758c. 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/NLE802400514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b03c406a6f349204e881c7d133cd741f24e06a8257842c967a8b03e23f5b4b. 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/NLS762400398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbc05cef16d70a074256e3025d9d99d9b941224eb09f01ec06975e331d79d42. 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/BEB682500147.