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 0xc4d66547d986aacfc45ad77014170fee70cff5ee426715286d60dd1bbdeca127. 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/a41aa086-e11f-4070-81fb-757580bcdfee.json and https://artists.proofprofile.net/proofs/artist/a41aa086-e11f-4070-81fb-757580bcdfee.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 0xf40aa8331cced7936e8f77ff8b7c401fcccf18a53d00fec3d23aa748835666a1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA81990661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f486e625a03d33b2213062d040a3276d8ac64832536aceaa0bd8009dce55417. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA81990662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e47fa66239758f583975ccc705b0ff1f7fdca025d8e34b9149c9eec0998dc78. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA81990666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae0e03637babde3caf772a5dd040c97f9d8d0af7d82f0e65385b25ab7970b63. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZDA81990670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4110d03019c2f0ee932c10ff482fa158929f4867ec40b5cc8b5f5684f42d7901. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZDA81990671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c746d61c5a16d79bc6ce44811864ffaaf14194f40c282580cb99f2bfde017c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN42115242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70641d75e0b99ada38f94ca38de0c6c73e584976a09285b07b97c920a4c1f316. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNB2248226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf55636f630815617c70da8455dfa1bd12c90af3797d07cae1f1d60be108be6. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZWFR2335129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fbfdaffb68dc7a9475fe9a1e91429c1837891afe8fad320d6c908c97504043. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZZ7S2477249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce196e6045ea03f6d6cdcaae6fa8bfe0766962cd2dd07f673251700311e44d3. 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/QZZ7S2477252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2e8b2e9a4506e14b0a7eaf2e7f3948b1c964a23a87bb51dae68e27830c1df7. 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/QZZ7S2477255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7121ed8c3cbfbc7c774f06b43334694e6370d89903cfa216ee52a7989a6e23ff. 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/QZZ7S2477256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d25331b59f12c935688a09e7a7b08292899d85ffa1be09db2ecfc958631daa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZZ7S2477259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37a48730fae3eb84977140e489e598fedb2789fc20248c413686253e773bd48. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZZ7S2477260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c5f94816621395eea78c256c2bbd9c9ae322a5cd8ec302475a769e60c9d1bb. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZZ7S2477261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05a46903b943c250e4393e2cb7ab0c1d68ee1d4277806ea558e84eef3b55dd5. 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/QZMEM2554998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b0630801063e4df1f7771c690e2aa7ca566f1ebf5a2ff085557544ce3f1946. 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/QZWFX2518787.