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 0x81d4c7604fd3a7314e00e42cb5c1739a8d78a3148f8f7e9cd645c60a8716c172. 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/4e52c85d-9354-4d9b-81c8-e0045991ccb6.json and https://artists.proofprofile.net/proofs/artist/4e52c85d-9354-4d9b-81c8-e0045991ccb6.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 0xf38f6121b719ab76570eec47ca4738728eed7257fd989f538bcf1ea6cb579e2a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBMA21817999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a263e955054863d9165fb18977d26b6db256698e008fe9fbf2e233b6588ac90. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/GBMA21805304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd573dc5994727297365694dbf434245d5290eb28cd43d4fd4aae9a090713c0. 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/GBMA21805305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38f6121b719ab76570eec47ca4738728eed7257fd989f538bcf1ea6cb579e2a. 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/GBMA21817999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd064f3ce5bc85e6e002f7a5035b1766cc9a9344a59651979648fd1fa9ac76ec4. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/GBMA21940596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a08cebf52afe85008207d9398641a27b893891181c7e7c205d506f40187d22. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/GBMA21940593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb60f7767c4a28a39dd02c3a6aad6e64a9344326fbb00653c73a2081ba1f40b. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T13:47:03Z), 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/GBMA21940594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a08cebf52afe85008207d9398641a27b893891181c7e7c205d506f40187d22. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/GBMA21940593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb60f7767c4a28a39dd02c3a6aad6e64a9344326fbb00653c73a2081ba1f40b. 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/GBMA21940594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cee01e468c5756a5569bbda7f38a501d41b0216acb575ccc5ce107866942cc. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:19:03Z), 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/FRR642000090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2b2e5362cf1fa5add087a247ca4a64e04181d13bc707011054b8f13f5a1da8. 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/FRR642000227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2b2e5362cf1fa5add087a247ca4a64e04181d13bc707011054b8f13f5a1da8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FRR642000227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d598394a5a93878cfc95540c1d50ae459c6d0838bb8fdf2e453592d1454274. 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/FR99S2200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5667c167683326471e326643258e543b62196a8c6db628ee5b0326651554ff. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:35:30Z), 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/USCCW1611010.