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 0x580c0cdc978e9575b83a666a57ffa172a5cbf215f22c0a16633720ff2c453ca4. 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/9372b421-7ed5-46e2-ad7b-f2207cd43f75.json and https://artists.proofprofile.net/proofs/artist/9372b421-7ed5-46e2-ad7b-f2207cd43f75.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 0x24a6f59e7b117a874903a1a5e9b15b2440b4e9c38661bcdb127dd9b8922e9101. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZES72211970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb30b9f4779e446b421bf2bc61815cbb889b82fe192e12885cc6f94514ab21b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/UKZGC2203508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x887747203965fa99b95a2effdf923e3a1109ee85e51a26595cb43d01de609431. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM3DF2402161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b159368f2aef76be199267b7d577ee932e3b95ab730895bae9199a9f21d5a6. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QM3DF2402170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf533becf9334d3b3119de1e3b12352e80a3926426b2676d1fdc496e063367b20. 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/QM3DF2402172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749260d8974fc6d61a72790b6f688a47cdd8026e77f09fae7a09abfb4927dac9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ32559190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe97691bceb8c84569e2d43804182517cf2523c8050576b1f90304d54890f1ca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM3DF2408055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e65823d70bb7682f1129c01b5a8290b3d69fe33cb072b755c0d24226cf36a38. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QM3DF2411719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4587e3db7746e8a71192dcd151d4e865e6a2efd78e40eee3b4ce65b41128be. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM3DF2410696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b23de3011f912e84ebde880009e8a3d6b7b9d2533a5b8aaa8df04dbd82d0d0. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM3DF2410698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccd42f361c9a52086498b0209b43a54de0fd74ca620246a117c392687d2afa5. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QM3DF2411722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b27a16d8825d6afd3afcff981ee657329731f032355e22fb00694aad1d4e9c3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QM3DF2411723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366c8e1b5bcc9888564a3f89dfe3578f340e2c670c7243c5c70de956d117045e. 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/QM3DF2411725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc02250889552547b0520ad0cd91a1264efd49b4fef2d2878a920eda71a3ed4b. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QM3DF2411727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd020bc697cf489fe48a7944463fe3cf3883af87a32aeb93422ca903e8e6827. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM3DF2411730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7012bb08dc66053a00102bb51aedb15f521f88d88ef969851e689a0460486548. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/US3DF2519654.