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 0x756b82ca84275513ddb8feff997c36cab18b7a3dbfff71740737120d6cee9703. 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/0b054a47-d093-4f86-a912-a7f43632d21c.json and https://artists.proofprofile.net/proofs/artist/0b054a47-d093-4f86-a912-a7f43632d21c.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 0xbd1a7e15d54bc4f135458e5bed2e2c9a32465701fd6f57d432e73d49837db41e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBSMU5974586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fea3b94867e9e53f72df1dafe65729482b35dc13ac1f2ec2c5c07c7234b259. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GBSMU6063035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd762858f051df23f85b9792bcdbce24cd2d522a9640d0507add041d29849778. 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/GBSMU6151107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dfe980d99b56296957112d3677e60514a46ce63681e8e59448aba4fe4e0f324. 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/GBSMU6221217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28791a19ca6dfe33b2b2c0e7d246b71d9457bf87c90a451d38047495ac8f48fd. 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/GBSMU7504324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a53dcde76ac6201650862a9e96cd6315135341f741cdba400ded78b372b95d. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/GBSMU7696290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4973545c9823c222789dcde09684cefdbeb55df7ff7ebca6f4b69832081dde0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/GX8LD2336878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc8535bc09fd375b4e3b39a3e61dd210c603c3749eb3c6f11c1ec650b98e255. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-15T21:33:28Z), 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/GX3HH2353641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed029dcda65541256e1da0712d3f18c5c9d8bcf6bd5f83ea9266a39d00c8446. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/GX4R52371728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6708bcd23ddac15cf3735854dfb0329bc2a256fb0b158607259c44663ba90217. 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/GX4R52376093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb231a58190d30cb2e1ba3a7436d716b107202b92e9f05ef4f8b2a94fb4b39c73. 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/GX5MY2353851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ae03e374d0cc0db3a637069dc81ead18736456c3cee3a3e0f40019a6527486. 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/GX89G2405929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb8ffb5df5b823a846f304b14eec4f4d8fea5bbbc9ae1eb4fceea1b27ece3d34. 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/GXF972489647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a165ef4dbdc961086674cbb58a951469018cf4cd19ddbe4a4dfc0c6c8c1b20. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/GX89G2561667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf971db4ae351ea23f2fcde0df43858b8962dd777876515142e700933e78b9026. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GX89G2533144.