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 0x1e81d47f330d89702be1420297c700808ffc9db89c538fb7d98fc0d1caf9e5f0. 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/a1dbe6e2-de32-45a1-8151-56fca7c74a71.json and https://artists.proofprofile.net/proofs/artist/a1dbe6e2-de32-45a1-8151-56fca7c74a71.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 0xc035f3e53d14ba4d1448f53cc269e0199e4a1eb9d238015d1da501258f705f40. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/GB7EJ1400489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4927892c3b8c40f260317e88feb864c88746036aa6adf4c045a58df11e6c805. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GB7EJ1400491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ef07ca57aeb107d1729cb38bac408ef837326d807028c5e2122de7a98fd3f2. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T03:51:40Z), 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/GB7EJ1400495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4fdfe5207cf2b5504192130e9b1d1e1b404892820edbf31ef40c4ad02d4566. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/GB7EJ1400496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf13e517fd19bab8209780f25879d83238e1be4f2cdfe00d8eb44723ef9d7e6. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/GB8KE1355695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e5f9be48c3aacc38ffad850c4d46aeaf268c8be0943a3097de431d615b302c. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/GB8KE1355696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26fd70eddbac71e43ab9eb16cc34f3ce35acc2682e6e3892ee50a9090cc8387. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/GB8KE1355697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a0521b3d20577e134f3f33c87f4016cdf619f7a3976c2245b7cf9145481fe7. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GB8KE1552072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd943f427ec0dd3ac13bac6c3eb442d801f43a567508d8ac8dc0cd7a81395fc. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/DEZ651374157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d9a2052b1306927d036eb2f1547f8712166ed3c2395e4505d0acf744eabc2fd. 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/DEZ651374158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b823b27064bde1d6c37477f832d4eb5f6bc6b32715247cb9bce340f5922135. 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/DEZ651374159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc314c5a9feffe8e3daf13d2a44176b6cca408b6e0613445d245ae7d5d73777. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:35:15Z), 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/DEZ651374160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b62509aea4e1af9dc53b5cfb8b20ea96840d3f92630298322d44310940330a7. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:09:27Z), 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/DEZ651700623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01d03a0070651a0f2023105fbe357bb33b4ecef1954ec77e90a7f4afea4b017. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DEZ651700624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5631d07e69d5f4593151ec5d2f533022a20d0ca62a0c64a856e151df81b8c634. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:43:30Z), 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/GBKQU2315219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe076bda7764592314eee576317fe7177174938abb2033c19b0dc750534a7e37a. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/GBKQU2446698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd191effac7cc6a44853f8e5432ed892f7790f3d5068f38947b8ff81f172b228d. 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/GBKQU2446699.