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 0x9fb01be157d2957a440065c75fdfd6b407e8f0432bc7c524303fbe8ff816f8fd. 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/6920fe63-cf64-43ea-8431-2a9bc3c74c61.json and https://artists.proofprofile.net/proofs/artist/6920fe63-cf64-43ea-8431-2a9bc3c74c61.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 0xf6d371dc2ad9e637d4daf0f77c5be43da0b5ea51784cce4d90edf8d91c93391d. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZFZ31998336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b8a9f8a0bca2b0619a64ee9d4e8dbb3d28e5cb37b016b12b49b93b336d33ad. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZFZ31998338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f25b731b17909fd03df39e1738edd4280bd0aec9e6a31c16757b60eb024b1f7. 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/QZES92006855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4f4f40f258f35f89585cbe9494f42cf9b04a36b5f995c056ee9a1d4d33a192. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN62075437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5930ffdf38c7bf4f15e6870063180023f06849b109bf8baed649b553b7f7db27. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZK6N2077709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdbf47803645c9faf38047907935e36cdd24e2215336485423390a3d5f231e3a. 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/QZNWV2067719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd3b3be147c19185d3a27ca4dba1e5acca99a7fb6e3e6f78cc538e157ed9b658. 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/QZNWZ2091138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a281fa1df3ca352073b21c72eba9806a1e2261eb99ef0b663c778227925377. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZES92189999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x676f0037c3847aec5bf388e299ad93917ddbde101df2e2fc9815597f705708b4. 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/QZES92190000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd1f588b8687ac91ecf5c60ae422c7ab8a5d69564082153fd231e8d5a603192. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZES92190001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9d3a8402eaab8c5f00edd3625b7141bac3085ba6442d26df1ca852709c38ad. 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/QZK6N2120284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd32de9d573e2f192fdbc193180915a45d021ab0c36775671b9f446c3329414. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6N2120286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c17451a670ac37ef5aa6e37ac50e8090961de6b9fb84e71de921da84e51f613. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZMEM2128914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4ad63a6f3439ed268ed109f197479926b15ea4d93123fffa0b33b63bd940ce9. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZFYY2201986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092df365dafd1191fabc2dc71e033cba28f7b04220242274b8358c5571f14426. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHN52202419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70dabf4eeb606700fba12b480bea9636ad40a2e7c7012f888315a9920b4a0e68. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZHN72296095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d55687ae65ee42885d7b656d62538aad0ff618d6f0d6b48616857e90654dca. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZHN52316956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e763431507db040a6526abeb070e9c65c993c2da90a8b5455d4506a5cbde7a. 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/QZFZ32472063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5444a0f3f449a875618480b7ec4065baa92dc0bccd78fe56740f4f553d6420b9. 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/QZFZ72472019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07510fbb3537505cabdc0d80707aa4a245e1b0e56ab04b253b287f35093db30. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHNB2450370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5453271c031213c96ea59c6d795fcc047d4a9eb7369322c0c17da10caf3aba72. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZTB92401768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5043de23f564b2ea1ac8e8441821ad1152909d14b10b31b761bcd4d972206fbb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZZ7Q2487949.