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 0x1955c71093ec387337b1f2b15cfd547e4a1ad423a16a429dc956abc10e6819ce. 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/b4fb8f6e-8e84-471c-a6d9-4bf359390ef1.json and https://artists.proofprofile.net/proofs/artist/b4fb8f6e-8e84-471c-a6d9-4bf359390ef1.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 0x90114cdf68abb9596b1d91ea9db50eae7d8c05ffcb3ed00060d7fef1698c3f3a. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QM42K1607865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe611199b32c2659d34c62942d9a0b4de85c1d7eafded4175f147cf76cf21c5e0. 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/QM42K1607866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17622ee97976a584c233e858de81d76fd7a2458360fd21c2f8fa75eebc6b99d. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QM42K1607868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f57cd6369619f72c73e5a74ff92b58c04d65d220ac55028e88a9a3c969ca991. 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/QM24S1914908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca317a057144679f9ea2ca083207bbe282edfacd39623b9d3cf856f99f7cf38c. 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/QZFYX1939678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace2de786a15a2fe53c1dc53442e0a56a21e76e95119f6b17852894a0b550435. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZFYW2082193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee94c74f1ef2bb30ce8d66c07a7f5684fcce86ea9450b0abba9a092f95004227. 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/QZFYW2082194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe095e9c41c50c9fd5cdc81dd63304a68c5446d8836c98932712b9b8ccdbcae85. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZFYW2082195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b2e238207ee1f219ce684a55a822d5f1566ff17345754f701b83241565c256. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFYW2082196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c710cfee71a5b1084b4c6cfc738f081d20c248d774ef3d0a344024ce1e3eed. 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/QZNWW2100837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51e437569db66eadec9c51fc4c0153be0d3809be67f2a427e81c4d19a59ea33. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZNWX2275030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dac39b5401dc5095368de76708230f341f0457d795614126c0aecb74f00c7f3. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/TCAGU2304217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8acdf4af7697bf19cbc7f6f27d1d697816fb5a4778f68c1df83e7ebef0733996. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/TCAGZ2314709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26bed01bf8dd9354876ce0eef62feaf949af03010ec3132b164347f2847cf96a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAHE2304701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bbeffa17458a67459fa09880c8df91aa1ff9e0431b2883dbc88afa01a32c99. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/TCAIP2498433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0795ee979a4a83970b38a07e5fec28e36355f006228d83789d99fb3710fff14c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAIW2411392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9a96fa483b00fa9f60e0aef35004219cee9da93ea528c0e44ca50f034106d4. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAJK2596915.