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 0x9b405b4a8a9eb2f72e83b752207bad61a69a160f8a9a0a68be5fd67aedb23c7f. 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/43bd8df3-b11a-47a1-90d7-397c7f21703f.json and https://artists.proofprofile.net/proofs/artist/43bd8df3-b11a-47a1-90d7-397c7f21703f.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 0xb0dd7f7aa94ef22fd7808cee5afe5faa091301916df8ec4d676ce5921ac94d95. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/SE5Q51903381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb29a41b8cafb71a7963b85853047d0fc3da9e125c6c4779d0c6a6f3d5718dba. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/SE5Q51903401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41664ecdf59188341e278f1f33cafbe32a9a998adf32422b2fce87a3ad03ca79. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/SE5Q52000885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda0f3af5da8c1b82c640a7aa40a6e175540052bbfe72996e0665936a2100289. 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/GX5MX2225074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e55751da347624af5906fb99f6ed10e97e64f6070a8831c1d388ac21184c65. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/GX5MX2225076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2411530bf343391a646cfb7068047f294af441e99d810195189f7eef127cee66. 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/GX5MX2225079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55f2f93ae8ad3d2a221e1b1e9f71e76b0c4177ce5d45406c9ced22349d8c01e. 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/SE5Q52104256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95d68e7672f70773bd3551d6eeae92f125c23fb1b6a1678132524b56bbcb1df. 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/GX89G2283122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8037d1cef7926111194eaa605ca5763b23a938612d715bcaa8af02d93e823ce8. 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/GX89G2283125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe0aabff3df4caae21b9ed9337b56246bb39b21d7444b7d9f551dbcddeb217a. 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/GX89G2283129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d63b5d46fd34e12c4d4fe061e2b61250290e6c680d79d388dbf463f7760db9. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/GX89G2367637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fd7ca9db741e1f3ae5289aef347e946d042f0f9a954f3b6d442e4563aec5e8. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/GX89G2396389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d3aaa6a27b3969c83b0d25623c47f604e9ad1c95075549430c9cb78dc3cb50. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/GX89G2327381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1863ac4339c5ffe4fcd55979176bbd429f8a074578fb8dbadbb370ecb6b018. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/GX38U2396239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc7140d5fbad488e6c3d960d1839fab48483a8cd6d64ab83e95c081f0047ff0. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/GX38U2399413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c8742eeb2872335eb47329c263f3cde415e53bffd570387a6257c6f36b66ba. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GX38U2362143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff6fd9af60b5351721d1a1dcea3dadf0c582fca11532dddabad0041ec4c1eb6. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/GXBDS2356383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597e036b738f3ad197d3fdb8a2d38b95eccc271529b9b6b415dc6bae8ddee1a4. 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/GX5MX2416286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d421e6a1aee1efaec9a479e968129b969d4ed8e0cdf5b87faccaed988fcc9db. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/GX5MX2415026.