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 0x82939389fc883826e78d407a719449ae461d935fe5e0703ae9520602ca1e5425. 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/89dfa4de-c84b-4d9b-8c25-4891e40e6fd9.json and https://artists.proofprofile.net/proofs/artist/89dfa4de-c84b-4d9b-8c25-4891e40e6fd9.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 0xf08ba2b19e864991c0b02e4b6523f3c53620b8f0f7b9ba380fb98da65d7fc0fb. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6P2161342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9838fc5555f67ddf621ea25df0e06a432a6e2e0738811d8b5c24fd9c1a5697ef. 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/QZK6P2161344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4ef8d3caa92274651ba5ca5e0e5eed838c84cf9ae14f34dc6777320950f709. 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/QZK6K2153097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c8c1276b68db3e26c303e42d938169840879a4361d2e47b554d5436cbf1009. 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/QZK6K2153098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106175c426af3a2084b35cab0fea5a6f099167e0f34a4feab1f0af0596e03c1e. 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/QZK6K2153099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d72423ea945785866dbcfa1b52ba64ece88069a734f7b166f8d199f9eb3b08. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZMEP2181474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3014ba93fe5162fbcb5aa43b873d99512baf5729e963e07b59b9dd0761bd45d4. 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/QZDA62247503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd315ac68ed5bb23362822e9ec5133907b5e5ae7f61788795324994581140d78. 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/QZDA62247504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0acfc00ac6afde0efe744a1cef19bae05e55bf1f58504d45abcf3231164ce6. 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/QZDA62247505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd4906ab87472b04dca3a8ba674305325a940eb6545a2b5d840b9b4206fcf94. 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/QZDA62247506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ce79eed84caf7c8ca2df7386632115b2bf423018bbc2dc204a2bc957ce44fd. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZTBB2362142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a3bc20ffa8b1dee810bd046049c61f6bb213868a491588ebc4deeb915890f1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES72430430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e82e4926abd51b9250f5e13451530557bb431156a0d0418d5d6fd56f6170b35. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZZ7M2493447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x437def7cdec479a78c9eacf19fe8daf4e1372abc0ec592bf936961a90b074d3f. 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/QZZ7M2493448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b9a2a5a03c163ca422bbe59eed7c4984b769c8e0cc2c58f929ff4776434cc1. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZZ7M2493450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb674f28cbb2f969f2606974b89b026ca46a4b2d2599f2463101e414bb1e037. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZZ7M2493451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16dbbcbde73e3e68f2fd64748be9aa772b1c85b3b5470a9d9d2ee2e9ecd11095. 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/QZZ7M2493452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b5aaf0bec4b7b3e526e140e21583dc3aacafa701936f82f1d82dc8b81df815. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/QZZ7M2493453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e632b3cc4b9ae39597457603f3cf07642146206add537bbfbc8ce0298cac5e2. 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/QZZ7M2493455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51148793d377c1a48afc15889a07ec5397d410a044b985c859ce0916636258f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZZ7M2493456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebd9fca12d4ec5a5565f6e091e98a933ee6f1e91031313f5cb3f75c00ae461c. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ7M2493458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63732d000d86b9bc5ee0c6f91fa6b3274013207c189e0979abd894123862592. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6G2541535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a3cafd1a8e33345d71fa912bd416e37705b4f2ea353b82493606336c684bb6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6G2541536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86dff6489b478d1c7cfc23a1597d878f67e03ebd246f77fa5f2cd7c44a7ac068. 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/QZK6G2541537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374b1e34e0973f557c516aaeba073fd23ee9ee32c334f162b9ed7ec46094d431. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3F62516506.