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 0x53bf3c24fc8a6f39956e25b692e2e781715c0e5fdde7b59f7a5353d5c781d3e4. 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/68b68162-7a49-4fae-a293-35471abfd417.json and https://artists.proofprofile.net/proofs/artist/68b68162-7a49-4fae-a293-35471abfd417.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 0x0c98fe0877e8b55519473a5797397f3ae98ed2f8cf08d18b7f6e48859757f028. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZK6L2100019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b4b650bf2f91770ff127979f8258ae210404a1be291bcffbd052b65aae9218. 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/QZK6L2100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5052161fa111a9c90c264e793d06f6de89430e9afeb521e3c85411b273b234e. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/QZNWV2109853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d9e32207466acf9aea730e8c9b518d0e4d28f93871b86c3285856f82f103ba. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZNWV2109855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d853d4971a5334561853cf804695f21a2eb24f2490f8c3332eef29d3e71ec44. 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/QZNWV2109085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630dfd16fc216ae9024741e9a6e86ec5febaa1307c0ce36f107604edee5a7dda. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZRP42347919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1938db58f66f5e67e626fa31b04af62d14f2d50b7e0a8b8e32f5eb425b3698f1. 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/QZRP42347920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe805b481409e8466ad68ac42c08f2445a3f327adacdfdd80488d0157bb8cd650. 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/QZRP42347921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc294d8661c9680b3d0578d4bd5b27e8146a8ff44069f1d6ae6f368ddd49d7d. 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/QZRP42347923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141f8b04f0fbfa93f6a9dbf979f49af2b70662a934dfccc026e201f16d2cf80f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZRP42347924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404594e91beba44029ee5e82e5985c42deaaabcc8eb921d5dd9231a400e49979. 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/QZRP42347927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877ad26974ab26c3163053b70c66f2d620da7378a48bc72e57c2a4233cd6106d. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:43:09Z), 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/QZRP42347928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb548645b3593238cba5065c5d6448b1c3794d85d8bee266edc15b5f64bb07c. 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/QZHN42452763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a315c9c09a268731d04ab3eeabbcfc0759d75d452272fc825082ea4de6601f. Chain 2 (Bitcoin): anchored in block 957611 (2026-07-11T21:33:50Z), 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/QZHN72532807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd186787ed04f08ced9da2dd025bb1e6b7b1582b91f48e73a2ad9b97cc5c5462. 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/QT3F92599736.