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 0x9b86df97a381fc9b5e88a831cd5f264c69778b940af76e2dafed4136e3a27fb0. Chain 2 (Bitcoin): anchored in block 953599 (2026-06-14T06:43:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0db8b1d7-ab16-4497-9090-b25e7f52e40b.json and https://artists.proofprofile.net/proofs/artist/0db8b1d7-ab16-4497-9090-b25e7f52e40b.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 0x9eaecaf0162501efbb66f06e63074277e05372ddcda0296d8b5497463aab9beb. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/DEPI82432946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b644171fa929e128b8a8397ef9ca5730938957f1fb5fc1ac1bc0baa5f6fb5c. 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/DEPI82433072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4353bd5ffff798148ccd5f894d62429555b2720bc26337a3d3a3dfa32cc13cb4. 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/DEPI82433448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00d7cd2633f36b9e8fb00d6b7527d187d4c475d19b533c7f1649d88b21063b9. 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/DEPI82433447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83698aa3089f922cda8af815c8e1ee63fb621adac7333641abb5d7b988642d23. 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/DEPI82433449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89bf09bfddf51608decca85f1a9d34214fbcdbd17ab51d49202ae399770db2fc. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/DEPI82433450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7987f425a5eaa66bacddd83f9708ed978763ac2e5ff4d20668cdc28bb2d11446. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/DEPI82433267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3b52f436e72448841f1491da4978c665478b87afc2c74c128dde199d84698f. 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/DEPI82433650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de819b33414cedef5fea0e926aeb730863354ba4b192afd19f38ed527f55dad. 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/DEPI82433653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72486ecf27c799ba885ff3f84b3e25424c89da7ee343b27623c2224d284b605. 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/DEPI82434795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8a892ab1c615b52cd6f20693ed0828a4522fbfac78bb743f0d18f760fda1fd. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DEPI82434797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d3c3d4c72746f79337e356686c52d74dcd17e183c8290fe2b6db71f32ea7322. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/DEPI82434790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0011a55dd12186bed4e0ad2882eb0690f6ee02153a4b3ec99b3ccac573cb603. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/DEPI82434798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4974181de7403ca867ea6e2e7d4fb42d2c90dc2e7bf1db470a0aae8de50a7f45. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEPI82434793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9205f5d2ac5be137c83bd9d2bee946137d7c0a1157a4e57d64530e06e1a522f. 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/DEPI82435048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa2530db5104939c15a675d9d5713b540a82691814dc7c12a228f4545053b6b. 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/DEPI82435046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcd4448717393ca8ed9243735e0e373bc55c9047f0b745122d5475b53f6bea0. 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/DEPI82435044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a529e6cfe480df8050eeca61fad372ed8ebc1e1cce5eeecd5058a5cd1672ffa. 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/DEPI82435110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74ef5cade62531ab61169de6f977d2d88b867de6f010c8134837ed24a0fccdc0. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEPI82434411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2406887f1dbfac355f9a400641aadf0f9e7608d0cc1c10ad535dbe74479ef88b. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/DEPI82435114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0412c1a66435db8b53b9fef3c154eca038ba083e4a883bca708152f0807da8d4. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/DEPI82435111.