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 0x69edf9494672a81479510976b5449e2c1b46e4ee934c39b2c9d863c88cddb963. 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/7d63d573-3959-49ca-a67c-b103230b1a59.json and https://artists.proofprofile.net/proofs/artist/7d63d573-3959-49ca-a67c-b103230b1a59.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 0x73b533ed242bd7eb64c605df2785b376058f3913d8aa7f1e1d33ab8f8f228570. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/TCADC1721011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941f58a7c14251303a4a7622c3018efa7f096ba9bd9db4498facb22de58e82ea. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCADC1721012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9696e65954e3e92edb4a4b1eb78eea02ac059c6aaa04734522cd1d47fc34a2. 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/TCADC1721014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33320c731ee590d1ad01a548ac81437a8511b2efe1f3f0dfd822f3cb3545c9e1. 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/TCADC1721015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b444c96dd3cf6101612efe82f85903fd3cb09b7bc27c9bcf8205bba55e21e6. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/TCADC1721017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d300dd98f8760aff51803ad80dc207f83ef77391508af60f3cbcdbf0d66468. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/TCADC1721019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1b7272dd6f752da27e7f87a22c90c4c55d868b54b05500d56b90748163562b. 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/TCAEQ2030027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da205ef528e27ff3efd7cc98171722740b5d1154c01aa35bbde1aea72ec9aef. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/TCAEQ2030034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4a770bce12392b6a1707f617b8ad0e5eda9e5d4a882474475d4c46b57fcbc6. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/TCAEQ2030039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f79fa010852dff9a56af276710b04744a9d4cec7577692410eb8d7636f385cc. 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/TCAEQ2030042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584d6a8762a795118811b904e6ed180586b2c90d2fac3964b12bc8bb2f44e091. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCAFP2193138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9826760dffe7a42a82f2cd086d4e888bee81929cac2b861cc2fdb4640b2e57fb. 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/TCAFY2158525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc239d3f91d6810b7a6cd9bef69e9eac34e376163af8d335523c49d30c3ba23ac. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAFK2121067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35eb19d556409e85b12f140ba4d96d03eee27ef39f7bd894a230ebff58220b26. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/TCAFY2158596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd937a302cf4d321405b146fec02dd76b7af5c26863c5dfcba2d00422ac5158ba. 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/TCAHS2377211.