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 0x67d71bdb18d5643efa10fb922cfc85ff8133c8aa4fd02d8ee8f1837dd57ac13b. 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/e083592f-87ed-4ed9-994f-4a4e10206b7e.json and https://artists.proofprofile.net/proofs/artist/e083592f-87ed-4ed9-994f-4a4e10206b7e.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 0xeb73760c595cf150f1cc324a5b64d23dfce8aa243cfb5852814406f22abf35d7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBLV61640657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914ba72e85e6f96a88dfa047f4c5beb7fe670b400e709e7c3840b7e5dab7a963. 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/AR8TN1600024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffe76db52185c010ed37d904694136fff748b354fbca43d15119881bf2903f5. 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/USSD11600326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80198467c1999c4877218fe6218becf524203e72df1570a3c59a9d23e636e9d. 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/FRX201745992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1cca88c008fef9a67b6730b7b5543177a6babbf36165f51ded77d23af4e795. 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/TCADS1872819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12e6d697fe77e3890cdf324d16d1dd256d0a8a48fb9791bb283c50757cbe4c3. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRX201547665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff554f93217a6f458a458602e4c0a14f2b7515b8e854881ffa9d077f3165d667. 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/FR9W11928588.
Folha de Jurema - Xique-Xique's Dragonfruit Mix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5067f1b4f988771278600e6bae5d51f2f6f7c9f23df693f538e789cbb00aa9a2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEZ651713346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aeb9f6a7d831340bcb6171981d613aa47831340da565ec0f54b80b73e7ad0fd. 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/GBEUE1700228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f19c85baf9902f8676ea41820b30af627517cc2f8be0388d6cd5d303a82ab00. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/US83Z1824421.
A Guide to the Birdsong of South America
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63859bd326957961b227fb21b3756cfe5878cdc2a0d6aafae524559f29bbfe4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLF8C1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ac63119c71a54805f6d1b67ed4052cbb41c15962a9fe0cf500c5c2cda76c92. 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/USA2P1919783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53db919dd8abbb2263a321bdc09ec14b78b9317bfe740c294cdf06a00d9cf410. 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/GB7RM1700021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7d74be658e9faaa842269df101a7c90d7d49ce4097d772aa7b4edea4d1192c. 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/FR6F31636080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f5c4b29ce6d2b457334e5248afc31de8a5e930acf6600518f7467864951399. 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/USCCW1610654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc42c6c3fc1487e50021d7a0928c5bc95f99c8690fcd71144a9a026561cab606. 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/USCCW1610658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8bb321102be698023735c20ad3c782ae80931fe672e776e6b40d4c771f6821. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USCCW1610659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a81cd6c1a5c262fd21a5644d9a60d1513829371fdf3fbf91d9fc15f8db4172a. 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/USCCW1610660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb136a05194d7203b87c2984d0d8f22470a9b43d1508efefb28b32d8959f85d3a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACR1617165.