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 0x10874f43ef0d70e74e5bfc7e30fec437dc9191af349aeaaff7c3f2a36ed02ff1. 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/a8d5fb4d-f8d6-48cd-9a48-53f9f7df628d.json and https://artists.proofprofile.net/proofs/artist/a8d5fb4d-f8d6-48cd-9a48-53f9f7df628d.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 0x4eef8558bd943dac473dde7ad8ce92d05428c59ed935602cbb957a5f736f96b8. 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/IL5842131265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141b8c231442d0fed5de9a568ca4ee127e7577aa634ebb53aa9c38e78858c54a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/IL1012100282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff072b8fbb2aa8bfae479f144492c50b268060a4f1f14a880b6f21d5b58d9bd1. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/IL1012201482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160b0dce78efbc3b4afb194ddd424f53ef1bf190d2f68ff9dfc325addbf8edd5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/IL1012300337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce860a205f04dcde104b91dcbb8aad3433bb3f30f29803b440b9e898a230efd1. 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/IL1012300628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141b8c231442d0fed5de9a568ca4ee127e7577aa634ebb53aa9c38e78858c54a. 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/IL1012100282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d9b81fde7b124a9a189c265aad5e1cc78aa62c0f37676186ef191e4dc86460. 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/IL1012301572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ff7a7e4e8c6b3e239ec9f527cb343fa56547e31e94a633f4c802bb78a837a9. 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/IL1012100811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9238c8991f5049b41400335410d72555248fa0991184198ee3faf8442fda40d. 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/IL1012301573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30ef79f7646007b338494aefe717957030b34c3b8f5447016eeec3e7a472190. 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/IL1012201032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ec316330a1b15797d674909b0cb0e9cd71c96e32645458eb5c808823e7255d. 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/IL1012301574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0eb72cf477cdccac8c0d08f1e16c7c885b984d539175456db5d128f30c7d84. 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/IL1012100950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff072b8fbb2aa8bfae479f144492c50b268060a4f1f14a880b6f21d5b58d9bd1. 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/IL1012201482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e650b6f5c08c5a95cbe85fcc15916fefe9a019e871bd40b6b249137268d9ac4. 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/IL1012301575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa66a0aea50bcfe0a51c86a1573ac26e749820eca74ce59a346d160988252e5. 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/IL1012200529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160b0dce78efbc3b4afb194ddd424f53ef1bf190d2f68ff9dfc325addbf8edd5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/IL1012300337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bb78bbb4af0ef3199b41e3d7a8a01722dac0c5a16bd94c824d327d3bc9e498. 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/IL1012301576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce860a205f04dcde104b91dcbb8aad3433bb3f30f29803b440b9e898a230efd1. 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/IL1012300628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc3da223bdec936f62256955a966ca717a56b205054d82b00c3df2182651c17. 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/IL1012301578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37058ea15a98eb65939c3ff7292d734c4982349678425eba6102e71f387a0bbe. 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/IL1012501089.