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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59086b446d992dff9e2c0388b7a7be315abb8c1025830354ce6dc62b263cbb0. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc967135-0a99-414c-840b-da0c50a0fffe.json and https://artists.proofprofile.net/proofs/artist/dc967135-0a99-414c-840b-da0c50a0fffe.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710a3c0f94adfeb1bbc053c510c2e4329314461998c04404ab384b68a26bb668. 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/QZNWW2152166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04fd520fc15b2185f17fc22d1dac8f97f8c383e16570472f47604a2bff58b3a0. 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/NLG661800888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8827eaeb72bf077890bcaa2e7bec0ef6d2f084fe394bade020e67a2a88f9f980. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG661800731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e515a131bef161c0b45bdacbce4b419cc2a25c3484af10b46ed976095116690. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG661800537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed27f8eec691441e772bfdc19f80c6a20f1ff3044a64595c2ec4e9ecc3179443. 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/NLG661700437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1867d8569396f0431f66f15519d4a69b925cab7b7e4164b9be3df5872df335e. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLG661700507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65bc30a5fd1aa5b78b323397c8fac1af38016591266d226334f8f0be99348d8b. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/NLG661700505.
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 0x637512f8ef6b4969ba9ebb1af296dbd2df8a2c3aa3da06c58196d8608cb8feb8. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLG661700416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf218bc189184c998dd248088250fc13d5513580c802dd4d1b1ef7668820bc34a. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLG661700506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d778a3e6f99d9792bf8546853d623e04bd43d320ec70a5ac10f4bdd98c86e6. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/NLG661700504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462e010974d90cd617a22305a685daf3e0490a0452e0e5ffdff0b6f287fa0334. 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/NLG661700177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bebca7953526af346953520094b2aa3a499c46f5b379f187fbd7e6e1bcb0ffe. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLG661700179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f48553939efd4a0b5c92c1686de6038d70e39b1789224c6d8c8b196d8724763. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NLG661700178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0258398d9cfb4887a1c12c311195edfd3b19f47ca5b7dfe8e9e5b11c957630cb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLG661700180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e59c3fd1e2181526e8ff8dad922ea272410df9249fa29a9a0fcaa783e13c72. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLG661600677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65a420c4195124fb48b0a1b15247a869018e8d4e395f5fa05601cc9c59b55f9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLG661600347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69990dba031c60fd189a5442b2016c847ffb82e317e63bfacbfa1df24dc4436d. 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/USQY51618419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5aa4a4b2ef1da1f39cdaf2edb6089f2bce98447af8cfc6cfed7dd1e12e9240b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USQY51618420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433da3b48f432ea72f25c2698f241b6d4b38054a4874b9007b1a5030b198649d. 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/USQY51618421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd776229eef4b4e35b9e1e1eb35d1197744fe2e10fef0d4a7f1ee99e2ac1408. 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/NLG661600439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f39e7da335847507c0090ba4367c35919f9cb992ff75fb2eb8c09c115babaea. 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/GBKQU1774057.