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 0x98bd38c7c13aa7144509e8a3b22c824f16edced67e3cdf339691d6da0e5b516f. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f373652-ab91-4197-8c34-0fb784a6bb48.json and https://artists.proofprofile.net/proofs/artist/4f373652-ab91-4197-8c34-0fb784a6bb48.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 0x4fbc5f9403e9bba2b3b8718027e10c65a8dddd1d73af714b2ed3cbc38b09bbf5. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USHM21342801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932d78e8dc3a0ccdd20317610002711c9150737935305bf6328ad2350b9231a4. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/USHM21342802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a90d1b2b6ebc9cd7e1c91508c32572e23ae5a85b75835c212d33d695b82f44d. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USHM21342803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ef2c77f007c813b0faaed282f512260f0dc24825f8b100ff56cb1661c766b7. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM21342804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a1875385cf3eade65bf03ce3c7c02391edb723dfeea4d711eaaed37f8ea943. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/USHM21342805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dad1ac7e66a6933fbd02fb654e21c073ef099dd62f9f3730929717d6c058ab4. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/USHM21342808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3857e3bd48d2187f4c79a9045ec452633f99050cd56e7f09d605a06cdc754e9b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM21342811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2e199c10442d7783fd4bf8d078109ffb9daf643d98f40701fd0af92913e7fc. 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/USHM21342813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0389dc34ca46004ff7e561436808ce7677e22edf2aba0321f650c40cd5f234. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZZ7U2590286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758131b8459a82d3a78f30dcfe0c0adc469aaa37f68dd42818dfb8e951d42914. 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/QZZ7U2590287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3402c600b6814ca1149f928899ee09f30cefcbb4f8eadf99453aca33a89f5bc4. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ7U2590288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c8e4a06de70893bc522fbd7aaa6bde0d3d8c48553adf2dc57931278774f9d1. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZZ7U2590289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331586c6e892ec86dac97de259de8cd49fcacadcbbf4c8ff49696f01699911ef. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZZ7U2590292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc9e67a312fa01ea69e7029f918628441dda54a6789ceffa62812ff855f0ad1. 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/QT3EX2546305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531b3a398539a023858dd45dedcd87c4b8b9d5ad765a90a2c2931006d476496f. 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/USDY41760705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3845b1e87b5b7d15046edc0c9d8fa677e51fbdf508abb1adcf8f617c03b0a3f3. 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/USDY41760714.