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 0x7423b187eb3a6826795ec061ed39c5fd2d763da6e612c0d7b95f33d5566cd1b8. 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/4a2b1b1c-a5b3-4ce5-a834-212a851eba8e.json and https://artists.proofprofile.net/proofs/artist/4a2b1b1c-a5b3-4ce5-a834-212a851eba8e.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 0x4558a94729a22b445067c36e554ca88df3de6a5b603569fd368a10781f23acdf. 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/QM9LD1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae3214b8c655d51f2307a0576cc35142e4e4bd7201d09abb19a7c7fde2647fa. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QM9LD1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75afd6cfcefcb97e263fd6c30b00ab05f8aa037a37548965cf4d4bc89d4bc85. 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/QM9LD1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96df878b9eb66b8b9e0721ba591a1f4fa70673fd9a43904e7a8f4203e6f6bff9. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:45:23Z), 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/QM9LD1700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d115d7e857980405b1375fcde98509c25a7bb8666644c118cd19045edd32564. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM9LD1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786674abd04816b1426354e27fdcc03946712bcc696adb6ddb09717eac3a1de6. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QM9LD1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7456534c0190cce17ff66d95a4f831c413355bc7ebec2a1dc44650edf0e05bd. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QM9LD1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cb4e0b508ff87782c8cc4fe8e1febb093f0cb02a0dac66bfa13488145ad7b7. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QM9LD2100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf269ad9cf0616fa8bebdd70417a590f1e5119e7f2d01926e74f27799fd2a9f01. 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/QM9LD2100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3c5ebaff6b4df47a7d1c3189112dc0bdfa3bbdeeceb02104eade8d555ccbce. 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/QM9LD2100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677d64e0260107bd8be03cc45eca6399e8eb56cc75719f8440c2477ed7fe7617. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QM9LD2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1555cc99b5c1d8934e78cb996b02fd25968ff0bfb42b852976a74861e9981d6c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGXC2300336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab93ae1ce4e25435afc0410c982ff1b835333c63abcece27192d7064072b56d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZGXC2401057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f72fd6438c8e4b056a526a58159735f1b2328fc636d5f3fa1b784ec9a6ca1e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:49:18Z), 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/QZGXC2500902.