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 0xdba9734ccec4ac4a0872de363ee23cb616db276ba8989d168fab1f83bd9039ad. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/539680af-bc9d-4bbe-85f5-aedadefe8742.json and https://artists.proofprofile.net/proofs/artist/539680af-bc9d-4bbe-85f5-aedadefe8742.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 0xd30a4242907bb2fba0ca78bcc4e7070799385629fab1ee824a5b34accb788653. 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/TCAIN2419569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83b1ba127dd6e344cd9742963573b679adaeb83a78cb65129586606606080f5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAIO2422047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb58e214ee263d1aab393ad4d9683d7ab79e05a419a31445be27de716bdbc45. 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/TCAIO2421969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a22411c5089e7820cbd74e76542b9b4af19ec7c38e96bec88af01a8a6753818. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/TCAJG2539233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348956418d101a010a46d01713aa0d3effce1544f60c469dce2b1d118e43106d. 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/TCAJG2539300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefce2fb0547e6431812511b0a0e13a2f49c595a1b25d775ad44c937c9e872ef8. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAJG2539265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7524393bff5bb679c680f98e7ddb69b24cef16747e4f1483b293593c624717a3. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCAJR2519076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3551b00f5a2013815196df1d3ce25da7f316c676e3e95c6eb767138b99c4c904. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TCAJX2539235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a17d1e3cc34fad285854e5faa89481a0b9351fa8026d98e21173391b701eac1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAJY2516809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488cf352a33ddb2da8b3aa7d5ba1688ef7fd6f3a40cc73405094187f80b3999a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TCAJZ2521316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1e720b3396b53ad1d5a108bbff24d7f961abb62dddf8b8d3960fa94da903a1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT65W2502436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x732205ebd81ae844773ab9b101fbf461092c4557a2212cbe0e4fb4d37bf21773. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT65W2502268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43cc38967d9050189fe1a8498533f3d051c5c359fae378de5a92483866acea3. 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/QT65W2552946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e3a33f6d31f0b5eb2ce0850b3c647b751103c21d10da4d142a5862d0d1ed3e. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QT65W2552657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18169c3bcde3c7b9bc6ee130861ac3cbb43ab709a691286f4f7dc7c980cdd096. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QT65W2553148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e51844c35ffadb017b86351316a348a81b94810b440941649dc2b787f20874. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QT65Y2517024.