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 0x8bdc119c44e86bf33e0320b701e49d012749e4dd69a354e13fb982fa697cde82. 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/d055a1fb-3b77-4939-9856-aa1c4dc87349.json and https://artists.proofprofile.net/proofs/artist/d055a1fb-3b77-4939-9856-aa1c4dc87349.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 0x2b42d4daf618c96cc00fcf76449755716fa67548e161eae9984d32cc9a45e9b7. 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/QM3DF2200413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e54efcaa3700ad86ea9ddfdaaf343ad69b707b4e4103f9b70f9e7dda1c2ea8. 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/QMANG2214139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772ead9815f8fdeec0a4a3e23463aafd74b8f3313f9eea676ed16463e3de413a. 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/US3DF2426689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6d142bf21067e9e94a26cdb53c19f7d8eba194449dd73b12140cd0e14cf3e4. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FRX762498086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae54da549ab32b01e8aadd89d46e28186553bab7fe01178867ad1b09a5851f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CH7812411949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5ed751a8029155a1e475c44682b3f8cc64343b0d52902155091cac1d7a4ab6. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/UKZGC2408458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640da86c519143223d1124af6b5ff55ec2807cbda23648c82c4020f2ec374ff5. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/UKZGC2410293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fa816f0fea0c3cc539dc6f5d10c7fefc6288095a3a90d9001eda8b4da59458. 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/UKZGC2410523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ab78ac260872a8641af1245e32fd36ebc477104e3bb2003bd1a6f58d11ae83. 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/UKZGC2500948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45d8526081d3bd760308c01583f4877be4e1bf85773b00b93d8c947a78ed250. 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/UKZGC2504365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd95ee29c377ed1dff3c3d96986bb13849a67ee4760d18ef19424e5bc28fc6396. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/UKZGC2407356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b1f59aa4f22a268611cf4bfd3a461c51d56404261a6b8bc78ef68eff03d4ab. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/UKZGC2407335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b46777618fc0d7c7791a6ee32ca599b7320789b565a35244727db8c8b35b34c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKZGC2407504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x640da86c519143223d1124af6b5ff55ec2807cbda23648c82c4020f2ec374ff5. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/UKZGC2410293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4632a9e146f3fdabb8181355a2bb158e3e23e09b918d3d6c9d8b72a215c8c686. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/UKZGC2503900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fa816f0fea0c3cc539dc6f5d10c7fefc6288095a3a90d9001eda8b4da59458. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/UKZGC2410523.