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 0x5163b1149316ffb92539513efd8fc9c2a2b82f55ef7b175837a4495f5219d7d1. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de406cad-a52d-4a2d-85fa-5375d14b7ac3.json and https://artists.proofprofile.net/proofs/artist/de406cad-a52d-4a2d-85fa-5375d14b7ac3.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 0xeb6d0016e6a3cb7786fdd746e62736c1029035ee09430bd52a514bbf3f7ae6db. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/NLB4K2400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5aea236ee357f29cb510e6960a2bb3ba83c837fc5920de7ab1b2f02cd25062d. 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/NLB4K2400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb748d42a0c2ccdf4da34a1bf427bd1abcdf0b1e76403dec4a4f0ac06581998. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/NLB4K2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9e24715326433814cab021c1e9df7eb787be3516720db6da939080af150917. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/NLB4K2400103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x673a27953d8e9da1baae52118f6001fe10d450e30ddc2d411e5d2f6e6a0ca485. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/NLB4K2400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab0f9c8fde8d56f96fe7f7ed4ecbc4f48a3bbb96e721be92f0464310e9e15a7. 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/NLB4K2400116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3386a37ba03c8658517977e41a15fdab80c60b33233b7c1d2985e2488b128738. 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/NLB4K2400117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02be7bee2f110a66099600bc716fa7de2bb3ce493fa9ef7e5246fd87ef5ea91. 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/NLB4K2400118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a66777cde3547644445adca65911fea14b3f7ec62439487389a94a8c9292880. 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/NLB4K2400119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fab76d3dcaf4fa7e6e73a1dcb97adeca2dad548ea7b162b096b7c5e8d50c736. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLB4K2400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab890536df183eaf3e4607fc2afd379af99d8898c08c56cac250a20759f4110. 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/NLB4K2400146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186d0076fc491e6ba069b1bb52f8fa101645223dd30c43147c611dcdde78cf05. 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/NLB4K2400147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92763afa41f56d139b5e696430224096a747aa095a130123451a11fdba046593. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/NLB4K2400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73b505ca70e09d6b3cc832409907cccdb1bd8d5af12dd851adf1bef985325a9. 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/NLB4K2400149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78ce0d697dd75b7b9cf53a1fb55845af3b91a7eef1ea9f28def53d5a701d3d3. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/NLB4K2400150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf979485ae8cf5d350e74fcfc16e67433e90d3e00309cd5499b81f91abaef47d2. 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/NLB4K2400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c159de780e6250228daba56b09c2f4909b9dce09a71f5c7401462d8dce16a5c. 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/NLB4K2400157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02841916ca71290095e11c63015425a8d2f7121c44b403987a0234aea89387ee. 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/NLB4K2400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346d8969ad307a60ffcafb6a940e7fc00844bee2a3cbc188e2bfcdd0ff8702c1. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/NLB4K2400159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ca0848e0fc54e2896997c3126405e3af32675dc279e85967f472b82aae153e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/NLB4K2400160.