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 0x52e9299da59b94e101ce81d73fe0e3ee6e9031cfed65dfc619c9b7076107dea4. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4de8fbf8-ae44-4b9f-aab9-124622c77fb2.json and https://artists.proofprofile.net/proofs/artist/4de8fbf8-ae44-4b9f-aab9-124622c77fb2.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 0xf06b10b31fa4d00760f4040ec981b83f429b1498eb58fded2a8218e4b46817ad. 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/TCAHU2472966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4771645ca07c3d73d0ae3f04efe7f64f57cd1cecfa343249faceae036fcc69. 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/TCAHW2438217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7137ef37c27a3eacba4780dd2c8dca5fd49fe08db1d04343798cb1f34a95e4. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAHW2448599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d93fca32627b8ccbd7fca59ea4c582dde1c4d64fb55837e9c9d6b057a0d34a9. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCAHW2487354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1503f1b5ddf16f9d2195b5fa0534dbefd6b9727663b1831f2cd397fc0ac811. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCAHX2428690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc34a5868ea87058af080707f2ac91716f96b7ddab47903d5aa586faf217ed85a. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/TCAHX2422537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd67baeff4a1a541c4e7945c0d48118f214c9eaf9018e8174ed93f1723f2906d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAHX2491688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7c0cf9cc279d3be75c76c7f1fe93a8d8cd734f81816fe075b942ba045a19ef. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAHX2498451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c4319ad54121f1de3dbacec2b90a66a4216ea60a72fdb4b37ebf0347475a98. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAHY2426528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797929f77b6997dab86cd11f51449af7396e83b5bc5834c709e2b20c31706455. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/TCAHY2439852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4f49af5c917734ac4490ac635689fa11baec64adc2f4c9221546e47fef0059. 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/TCAHY2449258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe23e844ac7392d4b8829ff87d83d2023253cca766f06069e13e71920897ea36. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAHZ2429136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15819d3bbb8a5bd19b99f16bfeffabe370b6ae0a25de056e466783a7d11b9578. 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/TCAHZ2432796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb400861414af66e7ecfaf899b298c68badd9ddb25ea10db1d4f6568a20d316d0. 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/TCAIA2412115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a8c231b7df409eb59ca926b641b07a20b5a36fa65dea27b718c62b622085f4. 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/TCAIA2461878.