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 0x94bc6ed5447b91f7d7e63fe683244b7e4e6ceb0e110ebbcacf5e7d09c9682b09. 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/3a526c9b-48e1-4f9c-b24a-b490ac2ace86.json and https://artists.proofprofile.net/proofs/artist/3a526c9b-48e1-4f9c-b24a-b490ac2ace86.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 0xa135ed17cf2410019bd2122a9e9947d1364ef309056bf82e04143bd49dd30840. 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/TCJPT2200066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127845b7731a28a44b68cb11f63689b1895ea3c47efc1559cfbc324ac923d5c2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCJPT2200104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610e97fa6a406712f2313e94e786fc533a86ae195459b1f1b34a2568946efd6b. 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/TCJPT2200117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6657ce4de177472ec0492f7821a53d4ca1fc6f78b0140559b93aea3490a1c134. 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/TCJPT2200121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9426ed89c334b9e6e4c0e23a5cff3393b9841fe920f5889df20def8a6e49e62. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCJPU2390374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded6db7521d228f9bf53e6849a6656c6fad17903ef4cd79cdcfca66d86223262. 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/TCJPW2395055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ed4c0bfa2e87acbc586aa97d59568d9c41573d1e86100d92176ced64bb9241. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/TCJPX2385254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecb07eae1d8b0144c4b3267b48d20f65fc5207597449d72597a474ec8154954a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCJPY2314785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b9a68951b03b91af559edf6ee331866d64097a8f071bb818cac04e2dfb6f65. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCJPY2314794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf645ac39936d70fcce537a952b9f7f731e68d5eeac11fce43a8fd76d4dd74414. 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/TCJPY2314789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d541f8139f5e5a222a9521e1a0d05118121c4d9fe5b9cab1fa7386bd0e264a9. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCJPB2493804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d11cbe9bcb86c3f276e9074ba1f09356116ad2453b91174aebe3537d62f40a. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCJPD2560544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e434e9307c69b614db27f4a3fa291fc03cb61f62ade2acbcce6b591209c97e. 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/TCJPD2562695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d541f8139f5e5a222a9521e1a0d05118121c4d9fe5b9cab1fa7386bd0e264a9. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/TCJPB2493804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe457ffcaf45881aa1e6e061bef248ac327f0bb5ce2bc14e5613abddd63225c09. 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/TCJPD2560537.