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 0xa43f982eaa6e230015a1921e4ce1c3c3039b858058f1657d94f8e2edf81f9d4b. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/445e2873-9796-4f22-80bc-28acf2bd4385.json and https://artists.proofprofile.net/proofs/artist/445e2873-9796-4f22-80bc-28acf2bd4385.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 0xe99c01bd867e092bee3afe1039f6f939b421f6432e7ea57dd2ae348942aaceae. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCAJL2597044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7b4b7132302436fb39c154e5f4aa19d2136f905296fc7e06cc6958df563a57. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/TCAJK2597054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19322bb3db4f0d0e9260a782e5d30a409953b7e021fe6b2f345d273b6ea7679f. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/TCAJK2597058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd6a8194566bc0bbcde13e50c3987732ac3b1a8e205f2a59e04afdf59f9fd68. 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/TCAJK2597208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cafd9538f29d481efa75a4ccc33b2eab6b61112f2f7a969483e27586637a4a0. 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/TCAJK2597159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12c26368a975318a7a7d346bc40617cdec849e1858d5b64a8e35c367c51e395. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/TCAJL2527603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ab224ed21c77db5255633b46b5393a2a1ad5c6d77e0dc235cb342de805a235. 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/TCAJL2527615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6d14c68d3288443a71b7e8cf8bdee81c9f5bf9d9c5fa04a355d7d569d44684. 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/TCAJL2527662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f6a8d91dd4248385bda9c0a73128f7ee171abfd5b492230869e1fbd86a1529. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/TCAJL2527628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6df6d11d4200ed7a1a5ad5a89000e8806ceaaacee17e62ff8c3da7045fc59a. 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/TCAJL2527594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611edc4800f47d4fb68d75e45f1143fb88d1c519acef532088991768f3015c16. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/TCAJL2527648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555f591cf729895572ad00267816a3745b558a56fea75bbb18133b567560f32e. 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/TCAJL2527726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4da31a2ea1a7ff5ed896059307742d77c049c3d84c263b5104d203de28a4e0. 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/TCAJL2527771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2117d8fdcda0f722ffefe8219a492264e08c9094f3fc28316f45fd0f65507b9d. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/TCAJM2527776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c470d9c6b1aab9bafd7f2be0e194f3948f6868c8d9b5e679171ca3df3a8d83. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/TCAJL2527769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a97cc56d96f3c16ad5c2ad032b072aed71f993b24bcbf298424d131e405168c. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAJL2528801.