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 0x0301a9b10841a50eade5841c56408d46be0dd0b169c921ad0af896f62b29c28f. 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/ef6735e5-5a9b-47b3-831e-72dd3edb64cf.json and https://artists.proofprofile.net/proofs/artist/ef6735e5-5a9b-47b3-831e-72dd3edb64cf.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 0x22e82925391e62bf3c85205bf5ba9fea3d7e0ccab86e122cf28998895c313b3c. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZDA62511264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd844edaafe7dce5926dd018a652df6fa51fa41b5765eaccf5627f4c27d831f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHNC2586974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24132f66cf36efdc61454d82c14277a99d5e56e9f5f460bb41193afe244c50c8. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZK6P2559115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68658387587dd66c6d0657b232a9eac7a29c4a52362d461777c9c5da91db7f6b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWZ2597434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d859a12c16f6a2cd20725cc8bcf7a615346218fdeb2a5b17db302eb86132c2. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZNWZ2597437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1712f1e02f0c90b029495c3333183bafc1a271b6e44ee28c2c66599f6b32817. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTBF2584057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb9dbe9e8b9cbca1f1340e161f7412ef257a3d547e17f16c8745c13c577cc527. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPJ32508467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea46bb20f4b22da889ac29fd8762f453d55dd9f613d228b821e877ef3e45977. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZPJ32508468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb19d3bd8d1bd3fa3b2189bb887248551de9e9a2ec42587201310214b1f4b87d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZPJ32508470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9203f228ce22b2d2f34ed2e99ae955090e715c1beddae52434ae0d6350b1c07. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZPJ32508471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8827dc67f8073dc210940390a5e404f6e5fc617b018f42eff3801e943099dacd. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZPJ32508472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7570e09ed0a00e16855c0f0530f534b55054e0a8e3cb83fc14be76eabf59e4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZPJ32508473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c53f4c12c74047d824a5804f5ca8f5ac4880f928c723a6236810462dda4bd0. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZPJ32508474.