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 0x975f4dff30215349fbfdd9b76032a5b8a24958a344a24826ed5c372a03df7615. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6acb5355-a26a-446c-93c8-92b71df28254.json and https://artists.proofprofile.net/proofs/artist/6acb5355-a26a-446c-93c8-92b71df28254.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 0x6bead55b17a3626a9c29a91227705d2ad9c9e6959b1d7708c6fa26a9a247e366. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QMNAQ1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63144f460505bf422192f085c3b10ce2adffc146f6ca692cba890137502e6e9e. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QMNAQ1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1669fdfac0b5163adb788476c062a2bdb17f0ba6c6749d77552b8edc1b548c1f. 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/QMNAQ1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15161963e205149405cd30be1fa9cd8e9cf4e2f67c3a334f9bd985044922417b. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QMNAQ1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f44d56323fefa1366ed6bd02249683524193578167ac6b0c390b20f06f8b30. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QMNAQ1200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d87de10758e13b7c56a0f3a488f28e5b708c8cf4f3d65bce545fed70c6ce49f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QMNAQ1200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4527f0e3a348e104d03094e3589df8939cfe1c3cdb89f7632f3e88eeee33323b. 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/USY1R1440806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f4ce74676d4af9dbcb58cf6ccbe505aa7b325d77c1e6f38e15f0b5037db5c2. 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/USY1R1440810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd204f9487216cdeef4271d12e37b61daa8dcff5261f79cf7c937d914f8deaa4. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/USY1R1440811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9751fd3b54c8290e8a3fbbed253b85847aa61e3bb9602717b4cbb25a3fb30a. 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/USY1R1647502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce81cec9137748add4492747722b027c77ee7a4d330c0d4a6bd697a8dc26564. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USY1R1647512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781f099c7efcb919e3d2800a808f27bbfae7697985f759d833e64ac8974370a7. 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/USY1R1859202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108ab42d6116d8368e015f19b9a636789563f9b141eb956e8d1b39b570a8d54d. 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/USY1R1859210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026b967f1daa64ffa50ffaa30e4deb10f14621cc81a19a29437060d5e8e792d0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USY1R1647104.