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 0x9d7dc26dc9dc4b0057ad38bcbf6455c53e988b1dab857f5ac020be9a14618dae. Chain 2 (Bitcoin): anchored in block 953903 (2026-06-16T07:05:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14237ca9-ce5a-48ba-811f-4cd93faf8273.json and https://artists.proofprofile.net/proofs/artist/14237ca9-ce5a-48ba-811f-4cd93faf8273.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 0x9a4fa5212acb340e5e5fee95dde52597e2580e0bbb12450c836d7fed9764ba16. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CH1087200231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcdeaa0fb9a7202e80fa1ed6a6e00b93920e12d01213fa5e3bfb9220c476f862. 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/CH1087200232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d41510ff34d7832efd058e6494175b0b409745942f76c67fccaee96231dd37. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/CH1087200233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b42d6d16db2ddcb8d1afabe888597d5e28084f383ed0312eae8dd6b56b38a51. 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/CH1087200234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb82df32427485987d3cb828013929f0eb5098031fabb22b6971470e4f4d10f0. 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/CH1087200235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e77a9273d84a06574b283ed9e49365c5a9ab2a9249637e81543395e5a2dbfa8. 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/CH1087200236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0cca3ff218f390d6ba5bbb7da233d43c112d67dca5fc060ed29770234e0b2c7. 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/CH1087200237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6b39fffd670586e588b80c777a3c82bbec5c5d4b9d2f58b59a275274d871a3. 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/CH1087200238.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4410e69ea8861589e04f7109a5b057dace9c0d2a463a86c17d9053e9ff56b47b. 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/CH1087200239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee82ac61ddf148cb1a7627912281f67f5aa3d0082bfdaef753e10428116b150. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/CH1087200240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3343cbf87fc8ffd03607d8a3ad70f929a419c9107cf140f58a937c474ace82c. 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/CH1087200241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4353c9a670be2d8a8ed92541b0c3860789c08d0492ea839228327520044c34. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/CH1087200242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a356855f9e2436ab1540965168f3dbbbcde6e81795779b56526437d69834cd9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CH1087200243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eaac040266925ed0957c6c5b72c156a3d3f9ee2876b1fd026c78a88127177fb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CH1087200244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4ca8dd4cfafb623a646acd28f5e08ef5ecaee7b58c7876bc96ee175a42e47f4. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CH1089800602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f7d62b9bfb88aeaa7020a65d5067c383dfbf2f7c82fab6b5334389080ac06a9. 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/CH1081600408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4e368d97da34502a95d31307630461b14c1bfa5d4c4a0c31a146568d00386e. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/CH1081600409.