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 0xe3ee115431d29613b39cae07985ee60c382df73167392f6e0cd00bb045895daa. 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/1b385fc3-6a7b-47b8-84b6-778952eafa2c.json and https://artists.proofprofile.net/proofs/artist/1b385fc3-6a7b-47b8-84b6-778952eafa2c.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 0x7b5fb703673b43eafaf62b78f58e1ede96277215c34658dacb431b15b28a24fd. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEHK92107748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cca3d15a3410081fc7177eaf7fb57c7235c8774f9096f1eab39a8a8f166606f. 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/USZXT2454175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f5392f4fc03bcc83d38c046a37d36112fcbb039b277a71b44cec3966795de3. 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/DEUM72402713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c8f9f051707de1425a25f345fda22a535f7be38c4dbe6f4fa8e0b0c3a419fb. 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/USZXT2453681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13e938bd8060f1cd5104da464db0fa44765b65bea82d67acdbcc28344a6f241. 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/DEHK92107754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcd58fd72a2a8da3b1bef60e6b9caee12db2d4de7de64113fd6da89757af917. 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/DEHK92107724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9f782cee4e79518f5fa78065608083b69c6b22cd6ac9368fc11edf8cc6adf0. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/DEHK92107717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8de9beaa14d6f6a539ddb8afb5fa023dcad3bffb84b136d7333f28b0f36ed9. 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/DEHK92104669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b097ffc692e2b977ffeff894a2a2caa2bb9fbeb64be410fd7e88612c303d7fb. 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/DEUM72410415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1725198ce38df1a6f2fd9fd33db0515468873186727f0ae3ee57bb1162e65d33. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEUM72406575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95c1dfdc89ce7ed26c006f4b966d2e20ca5fd169ad4f26d79580465100a31c2. 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/DEUM72403728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f5392f4fc03bcc83d38c046a37d36112fcbb039b277a71b44cec3966795de3. 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/DEUM72402713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa773d25fd0295348d0b092c148b7c47274bf67fd5a4ff302b72e8409843ccd74. 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/DEUM72401244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1725198ce38df1a6f2fd9fd33db0515468873186727f0ae3ee57bb1162e65d33. 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/DEUM72406575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95c1dfdc89ce7ed26c006f4b966d2e20ca5fd169ad4f26d79580465100a31c2. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/DEUM72403728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95c1dfdc89ce7ed26c006f4b966d2e20ca5fd169ad4f26d79580465100a31c2. 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/DEUM72403728.