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 0x88a7d6df4629bc0306e79c3c42c2968090cdd48cbaf02b4b42bd4fe513d41310. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b2e8c38-fd13-405e-aa6a-55d62b78d0e4.json and https://artists.proofprofile.net/proofs/artist/9b2e8c38-fd13-405e-aa6a-55d62b78d0e4.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 0x4a3809502bdb991d31988b83a4308ee301fc5a0a58b18af0284ad4d6e9ed52c8. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZMEQ2422092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6bdde36d1bea827d2d0414bd9a33335654635c1422470f964a3b73aabe6d70. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/ES71G1836954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5108c8d86fc5b00948f6b03f4bb770652972b4e3d095e3aa309f89181c4187. 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/ESA092316060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fbd587532a93b9f90759b71cdf56d5f20e63424e129a470bff5c383e39708dc. 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/QZDA52318334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004013066b3f8abfd59e90232704a0735e03465afe1cca00a039b22b6a5dcaf6. 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/USYBL1801361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28083ee7b8edfccf5d8c8340116d19963794a17055713b59ce4ce2fdcba9172f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USYBL1800918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x086506ab9f3ac54b5f60736db4172d95bcdd2dafc87612a06ee892f9d92290a0. 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/QZMEQ2433784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32575b06f319f28f1446c349ae845403c5831c3b57c64ea0b511b8a2b4e11bb4. 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/ESA011604881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c150d5473f127d4fdb57b9efd695228ce76e7736ba019a71e7cc45068a6a619. 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/ESA011604883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4a5dec65b75df6c9132eb4d84c0107c5e4a254dd1c3c53ba594f26e0f90f9c. 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/ESA011413421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c9bc6c621fbf77b278f06f56eba23fbb7384da7e6b9c96089ea493f93400c8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ESA011413430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc3e9e5e553dfe5c233071de18e507dd58b18e9f73051fe679e83e2dc055a1d. 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/ESA011413432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d4a1cbb82e14799f031be4e27ed1e4177f795fcab3c96e4f34c9e4257e8a2f. 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/QM4DW1555880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2de21caf1d3be5e1c57f7f5522997e0c5cc06db8b45064b0ca1f34c781320d85. 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/ES71G1923405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121803ce79249984179a85f7202a50377bae6ebe3df06fe20f81d9feb9035344. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ES71G1922294.