thumb|Statue of the angel of the Annunciation, , Metropolitan Museum of Art thumb|right|Schutzengel ("Guardian angel") by Bernhard Plockhorst depicts a guardian angel watching over two children. thumb
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 0x1748fae9076529f29ce3d934fce5fa137336087c9065f0a6ec2fc9557f0d9370. 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/60438834-fe90-4c44-bf6d-ec395bbef66e.json and https://artists.proofprofile.net/proofs/artist/60438834-fe90-4c44-bf6d-ec395bbef66e.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 0x552dffe1dd6586d0a9934906d0cb0ff78632ae1eec40f4ed0a03ba3bd0d9b1f1. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/TCAHM2344228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7e64d093f00be6a07b3854d26f740e051a2e0cfcf6c49e57fdf146ebd87bc8. 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/TCAHM2344181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b5e31ff72d862b9c91aa5e801f3799e32b39415ee58adbe95d8098cec8a097. 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/TCAHM2359449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16484c828c3ec85ed1ca953351a1f86788d4aad620ce8648dc75484bfb156eec. 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/TCAHM2390918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x460ca295158452c421dc3fbe67e4938dec9124ba86efe92e3602e2422a7c9541. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAHN2304668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b30ece745aa4b1f6061bfbc7dc1ddbccc7a6c2c644bb7460382cf28371885d8. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAHN2320363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92820465f3e11ffa70ffba25a9cba0e1c5f0361d9e63ab70a25aaed483a88fb8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAHN2361865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8068cc87f8f9f7266463679b9bafb7c70fbc0bd5feb64b37378762865e0a06ae. 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/TCAHN2359049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e14cb2c3eb2a05b6a3169fa1750eb01c34075830ca1d2df627df23f133538c. 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/TCAHN2367495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987c1c990cb92db11e3c0fdd155140e55a2c8c4afd37f4ee3947011f228b6fe8. 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/TCAHN2378290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78764c91e984e6b8fdbeb9ab8162d2126abf02521c95c5d12f9d7004841eff50. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/TCAHO2342287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e71548e0a18cd82f6d3832499637eb961e0c677227f4307e46edd1101fdf7c. 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/TCAHP2364620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ba07057792cef4ddeb5e9e2b03f1267cf6f208435915254c391229666a53f6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZKWA2315139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f5a869dd04bb9b1d5c7fdb7d8063d3388fbfdcaa4169a8ebe3a0fd38155f3b. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZKWA2315140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f902b5a4753b5059e4450a289b282268223616c880189a5d4c848c2d760c9bd. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZKWA2315141.