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 0x7bce187915fe22a92688a5a4a1a46e3f6a456cc962489bb7ee67b371c5bd6d67. 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/420d58da-3513-4797-8a8e-84439d4dc69e.json and https://artists.proofprofile.net/proofs/artist/420d58da-3513-4797-8a8e-84439d4dc69e.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 0x4711e907374c4bfb29db41e901151314540d4c925e7af6c1e7ad02ee46160dc8. 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/QZES62139902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3030dad5574e12698e2436689ae08a16a28296993c4e4e6355f7b8893c333fbc. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZES92114277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f996d8757a2eb4eec7dbd67fb903ca04c6dc8294a12e2d2569e3903d313e063. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZFYY2254550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2701114f6e96fb142e0954445371af06da8e7b8e7255873c018590b71f0662f7. 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/QZTB82394132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2abe554ebb5f65c0f7c55e932ac59dc9dd7b8fca301cce96b26e43420521ee70. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/USAR12300381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9a8a8e712c76edfa2882760c8c2d702ce5f4904acbcf0c73539cf39bb0b3bc. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USAR12400065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8a7fd74a9d6117c1e1438efafacfae95b8e253d1ae243f1a64327c8338a881. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USAV72400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cc76ed3a84e7055690fd58d87e6cf4fd5a216b28a74b3a9455322a9856ae9e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USAR12300479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7b84e9afecc21042c7316b1b3923b5cbc933b0b4dcd74dd1b717dd12f082c2. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/USAR12400273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cc76ed3a84e7055690fd58d87e6cf4fd5a216b28a74b3a9455322a9856ae9e. 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/USAR12300479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb956852064e999652ca11a36727f694624613d1b0511ef07aba31eaa4d73af20. 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/USAR12400251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1398fc260edc5aee32206bc87eae494b9ea7e8d558e3abbf7b9352970af9d8. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/USAR12500060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc364cb25537216f918c625604bb1ea175a1408a64a54662fbe19e708440794aa. 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/QZJG51931439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2085e141b61e47000b85ef89b76c3caff9796803a6a800e20f289771b707a33d. 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/QMJMT2002710.