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 0x04a3afcd288ee16aba1bb2390584fa1d6b2ae49248587616afc8ebe0447f21eb. 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/b2e07d57-e34e-4549-92ed-57eed0f52a7e.json and https://artists.proofprofile.net/proofs/artist/b2e07d57-e34e-4549-92ed-57eed0f52a7e.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 0xeadb79b227ffbc2b4d9cb723cc43a5cf3fda951f1362656fa1c071fa22624620. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/SKA129134801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e072a2f14456ac4e3c1bd7cb14fb5c938bbe306e9830795cd223446556883f. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/SKA129134802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f583a43b48595a4ee3336eedd96c772626ced6c34e2876b37daa8ea3bc043d. 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/SKA129134803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73af6203adbf05116a96651dcc9423174f6c3072f82652227adfa70e60094cd5. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/SKA129134804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714bf88216261b90bf79fa514126528e836bf5c546cd1fbd011f6dac72c8ed3f. 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/SKA129134805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0ce1d905a0f8e7a9ea71d160e6c480e583b3646dca73811db08cfa1f880da0. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/SKA129134806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e954be4553417c11d487835a0e01cac19b072251ed88fccdd38d2851f7a605. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SKA129134808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b809a861e70d763cf508e61b0956ebc2980e445a39678a7d70faed5942a5958. 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/SKA129134809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9bb70cb7e915948fdbabdd59d5dd178eee2cc491d9d14598efed003cbb40d6. 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/CZBD41214502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94975e2d1bdb26219810b44cb5456b73a5fbbb2bdc4cdef0ff26abd0a78c8c46. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CZBD41214503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48d669f10aa1b96ecb53157da851861a40c0a96fdefcf62d5524f45c9241999. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CZBD41214505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x463c44c46c023d5e2e8177414b5bca61670df669565d21ea8dba6ed25fcdc135. 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/CZBD41214507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6561bfe297aedac92fdbb645402ffbd661bd2c2a37a9a9c6b89052311b6595f5. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/CZBD41924301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd929cdf09746d7e698b5a7f5441e9d74b942c6b6817a560dd42895099a2d6c9. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CZBD41924304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddbb1ad90d03d4e589e6771fcdade7dbe4ac5d3f2fc9f115830c8395109abfc. 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/CZBD41924305.