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 0x9cbda32e8c564240eb23e27f9f6ca2f1710ea4bb69fce77df313946447eb55a7. 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/f6cf1a90-e15b-4621-9e49-2e4fe5aa05b7.json and https://artists.proofprofile.net/proofs/artist/f6cf1a90-e15b-4621-9e49-2e4fe5aa05b7.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 0xfb6d573ee88bfdef7acea2a566d531fbef6a0fc705c56bd320f24e87de2b2203. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAEJ1998773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161fd2d86ee5fb0f9c0db247ae828db85d9d1ba90fb64d6d4958018f1587a92e. 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/TCAEM1993507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eb3aa6122abbd0130391f20a6a629b61ffb406e921c73429a3a5ca5a91bf31a. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAEW2032893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e566c80aa2a41023eb5e60da9ac9afe4fa0865075949ad09451d226b47b0220. 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/TCAEW2032906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e7ead6fcabb780ddcd20594433ab372dc91463c972f6f048969eebeaa361ef. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/TCAEW2032909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d21a5004c6f251bae07804d1f74912480a7461e31a1e78fd16fb4b2aabff9c. 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/TCAEW2032931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745274daecde75aa24640c9720146dc0169aaea0a3c59bcd1cd790879a91e8a9. 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/TCAFP2165137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x993f65445149bede2c2ab213e22e0af6e499b8f6ac6266851505c4ee5a0be317. 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/TCAFU2180096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7803ebc005edb4b4ea735d7d7300de1a192c159db8d8fc9ceece5104168356. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/TCAGN2236863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89563d4fcb7f3182f47dfbfc95e9344d0216835262dc62eefff9cd3ee6fdceb. 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/TCAHA2367750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284b3904effa864c784c64056844e6fe547cd4cb6d77472e9edc1ca502c320b3. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZS7J2361071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976a53788651e02ccedeab0f13161a7ea35056855dc8e4cf22438b7f0324e7ec. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZTLA2413113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec7cd784d8a959477a5381b1f8d98fbaf3504debdbfb054dc21bcf692832c114. 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/QZTLA2436250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d9abbc8f7cfad2483d76f0a3ce1ddd4e747a3aea9fef783505fec885f41f18. 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/QZTLA2431779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de8dbeaf12c7ff6664f737d518e853748f648ab89ab464427358f721e7448dd. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZTLA2442802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4897f7d4e759cae34daf980955a64366bced92b2e02b95d0e73123b1f0d7fd24. 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/QZTLA2492777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333ec630ac4294409c9bc2a8b8abf426ea8304f922c0dab704fd1c7417607b04. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZSYP2458196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15f3f295e4cc8dc0b7fd11c72152593c2a1c97bebae4c99b729908793c15808. 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/QZS7J2433366.