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 0xb9b045355d1d9d87ebade62095dac4d8c49faf46d26409fd300dd74b580fd5dd. 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/02a21cfb-576a-4c7e-8ee6-0e25bc50518c.json and https://artists.proofprofile.net/proofs/artist/02a21cfb-576a-4c7e-8ee6-0e25bc50518c.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 0xbb88b033dac4a4c07d31370d5a396586efb716e9dc98f04f84bbc48318a7fb54. 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/QZTPX2139994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0defb651284534f43ace75a8ece52a3d8dd167c8f2f677540f39072b805ca0ce. 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/QZNJY2140398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3d44e503289d02b4c751b1de88c8e7ae85af08e331f4a0cd5a62d30a85c1ac. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZHZ32224272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34ca205e793d48b7292d92a9e9471343495bdac146d2db7a6c30d848b03299e. 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/QZHZ32224274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb88b033dac4a4c07d31370d5a396586efb716e9dc98f04f84bbc48318a7fb54. 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/QZTPX2139994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbe69cf267def740a11069ffa423d1fddd17ae75821829fed7f3a6807e8f58e. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHZ32224275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7ea4332c63e705ca727844867d4e6435adf4c4d2022fd2a8a61649d3b6b7f3. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZHZ32224277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb84a5e89256e62a956a9320f504ae2575456116b8a5be6ee3907729a023451. 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/QZW9L2386014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a21f40e1dbcf3792a41fb67da2728ff1155b5a6277824774dfec97110776d. 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/QZGLM2533953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232a21f40e1dbcf3792a41fb67da2728ff1155b5a6277824774dfec97110776d. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZGLM2533953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc548ef912d02df719e4f8ff342b433b9024b0819b7e0b93a05a2050e22d41c9b. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZGLS2544470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b3d6e8a375ae41f21318497ef2bca20aac52e8a79373dca2ac4609d9ea6d01. 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/QZGLS2544471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6aa28ccdec151a5adf1f8241d8de3de3b9daaf2542ce5dcfe7a15b4813a738. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZGLS2544472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb81078200b7828fdbf388dd03f3e62686ff014929e19cef0f891c9a8fde001f. 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/QZGLS2544473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d95ca34beef2dffb4804322fbaa5ac67d4a3b152b8b82d48d26c1c19ed4a82. 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/QMFME2248459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce03f0f74319069633f6fe609c68e02f036f52d73cd9e405cc4cea350c1e84e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ESA011778855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49aec79067fdb5e3003e137b3d7113f6964ad715db887c8860c9514e029dea9. 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/ES80A2420111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670f188e46e7aa81934cc727dc5d720116944b01790aef6f00839bf8f5863f69. 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/ES6102328608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09267499d2b836ea78c8ba0c5efa2f253296938574134919920d50e4433ecf39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES51G2400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6551292afd991a6cae31e2228fbe0c348276033ef38a63760a2f52320f09b0f4. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES97D2311101.