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 0xa57544c34baa37bdde27e0addea3a54ca40e1b45fba17322736c3c7cdbf90a55. 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/e6d3e047-ee4f-44b9-b663-d661535cc8b9.json and https://artists.proofprofile.net/proofs/artist/e6d3e047-ee4f-44b9-b663-d661535cc8b9.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 0xa151ca31849cdf9d32e91098fdb881478a8eb38779545acfab3c96396a18d293. 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/USUM71700816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded50dc62ce8197afb6b920a129c6664bbdec84ea884f17344715e976a796b3f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T00:03:05Z), 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/USUM71615698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46c9c70a809a59a80bc5994eff456a0f3e4b9185ed125735a0312a9570c6418. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T11:28:24Z), 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/USUM71705325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e80032a389b622eebc778c7b2c1b4be841dbbc4a3a82afbf3054b67fcf88a3c. Chain 2 (Bitcoin): anchored in block 958126 (2026-07-15T11:08:15Z), 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/USUM71705329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53bbeb0a42adad2cf03c82dcdc87d37ca7d483a2e47f27a861e1787b8554da8. 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/USUM71809241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173f6edc5fac001ee51cb89ac7ed946873f0a507475660dc4a27d076ce75fc16. 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/CAL452065602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d1e8ecb45f4b15a01819a96cde2d9482ac5ae4868271de919cd15e049df64e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CAL452065603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e4dff118ed9db073f30bd063c4d4d725772820dfa4b90412c139b9b3191690. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAL452065604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd3eedf3a6527f5cc979db3b496f20b861e48da0c26402e0ccd9e97608d92d5. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:30:42Z), 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/CAL452065607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f1f9356edd0d278113832216b893d7b127840343cd2eb0e2143eaf28673525. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/CAL452100301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954297c072686a32106165ba9ffda8006c12d2391685a64825d81a737f7af936. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/CAL452203603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc91c43861cf17611990c05474408923e2a334f6b2f354106444aaef7984a17. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAL452203605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c143e805f24f7e2d2768cce7bffc050488cd62befeedd57d10c392511f3a5b. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-27T13:38:51Z), 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/US5ED2406213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ce8cc69fcae506d3e4a3342275ac425c046355d80e756627ea1530dc1a14f6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US5ED2406209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa115ee4aea0f4b3741791d8bcbeb0beefe599cc6931d6b8c6bf2b633e99256f9. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/US5ED2405793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f46324a5852c546e72aa4be7bb6e5cfd417f6736d5c5ecf002da92f1b2dd8c. 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/US5ED2406211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c143e805f24f7e2d2768cce7bffc050488cd62befeedd57d10c392511f3a5b. 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/US5ED2406213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72642a67a6ac9474ee96f685815f4767347ddc0b38e36f76fa8dd974ae210fed. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/US5ED2406214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9eda72e7569c093f7e0b2c40ed33868a5e4737ba1b915c422618ee7d4fd6ce. 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/US5ED2406216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e1a6539a5147e6741f14f68a6656778f989627cc3e6945ea3be7e00706d45d. 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/US5ED2406217.