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 0x96d333342efa4aaf92e18241f16abbfb47268f34947de86160edcdae394e94d5. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/74f04299-5f1b-4402-b6ce-a5d6a365527d.json and https://artists.proofprofile.net/proofs/artist/74f04299-5f1b-4402-b6ce-a5d6a365527d.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 0x2a2720a39f382318daed8c85cd73a522bcf34893fdda2662eda3673125a81c11. 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/TCAJJ2508378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b588596d8825f4a4f47d52ca4511778536e798e9f45a97c154b03426927579. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/TCAJK2508395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfd2da2e1e3e147e7f682c54764dea2e197e7c50ad7055f39fd32e6e57a9ecd. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/TCAJJ2508399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366e0700c6e309aa61f5b8babdf2c82360e228d4dc516d858ecd073f0ef103b6. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAJJ2508413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380c098bb00acf72157247f96de4ce251a3dd6c3359a57b10b5d6b22e5439af7. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAJJ2508426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646a1d3bdfffd8c954f5abb103b0cf0c67ec1d4c90cba2e3f4f851abee5d6ee1. 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/TCAJJ2508429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440b3c3553920e2749752cafe6644b8da6363213d61d2d14271429286f2fc929. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/TCAJJ2508433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3666afe2bd8c2a266a65f25c31acce8047e76e9ab1e3db3ed6cf88474d196a3c. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/TCAJJ2508437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2970609795da824bd3f414a925d18eeb41047b00ace9542ce9eb7310a8bb8ce3. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAJJ2508485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e546726fc09cbc8a0c1e7911088e9e72d215ee0e2851cb5d5abf7b7466d3701. 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/TCAJJ2508499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e26ef57e3043160a0abba46cfc3da706c8e6aa20e143896dbdaae9687580a0. 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/TCAJJ2508505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191abf4f263e297d34ce00cded258d8ee114f464aaf1eb3649aa2a00e6d74ceb. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAJJ2508507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee197a5eb7710a5140029f031b06175e11f1cfea5ca6dc807c8774c674b8902a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAJJ2508513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x972863cfdb74c502679bb7c3fd4bfe113f8a17da23c101de790b253ef54fc788. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJJ2508516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e2a50ad1cfaa4ef80d5482fd3cf8e483eb648ceb6798556d304ddcd353a5a2. 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/TCAJJ2508522.