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 0x788c3ee26e64a0c0508e1eaf4d40cf78f930f085b245468864530db7a19cf5e0. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84e7e003-af60-4632-b3eb-5a1e78891418.json and https://artists.proofprofile.net/proofs/artist/84e7e003-af60-4632-b3eb-5a1e78891418.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 0xdc51d8764b4b929ebe5b2e1ea74dd6b02379256464f4b09e1ab52a4ca1141c92. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/GBLV62204928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2138195d37f00b0efd041bb9e06be7f21bc21ab951af11c6933c1e4cf51eba. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US83Z2350599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ea2f1c3c91ecb99f0b78c6dd88daf393aab7c15335dba09eb99a683a8d3fda. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/US83Z2350600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e90733362956ea7a9839aaf995a8572b644ca1d2b4bba8bcae3aa7a41b34ea. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZWDE2327620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40a222bc63e33257a3798361a6ea63a3ade1975f9aaf487389a9b3eecd95c20. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US83Z2322292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6331088cc75eec604940169253309809ce69b7fda6240a933d6107a45643a269. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2310863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f9222d4c1c800cd26bc3649c2aa07801c9a5622a34507e86b6583fa1db65fe. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2310864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9f98fc3e5e51ad39b1f39c3888626fe7693147dac0066dbc5c4fccf79e7865. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBKQU2310865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c53d3e843fa7dcef77ec476b81a9444e8defcf12a1ba40a3f0826985300d618. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2158284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0413f201743d1d407b0baacafd978eecdf3c0136460f47c525859ccd1f5080d3. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBKQU2088613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063c771c01a852a2bb9a311332efb12f963047067043f996f19f364d2b7ca768. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZ5FN2029995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8ef9519f43501360c38cba8201f03d27267b15e75f58f04ec0e1b70ab4c359d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU1613337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b553db6f365977b9be1af41dbf47490dacf8fb1cbbc20c920b05d3b5a0b408. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CA5KR1514267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b282f2d4909935e921dbff1a9c4b2ba4596db62229a8726cea3fc5c3d4f2d36. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USLZJ2150518.