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 0xd349ac6bad6c136982caed8060c16927bbed159b817705162cdcdab6142b7b5b. 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/51d00d44-9dc9-45bc-bf85-8edb0cb3f9c1.json and https://artists.proofprofile.net/proofs/artist/51d00d44-9dc9-45bc-bf85-8edb0cb3f9c1.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 0xf99b03bc78dcf25b498ce7c22bd1e8307de8fd22c04434c8aef3a2729676d550. 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/PLA552400523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd55e8bc137b4be7aa9307d8180bb0f306124da3f7a401d7917e6a3458d5214. 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/QZTV32344094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6dd073b90e64f2b0c8288bf9f8f99ffea4d3b72459cbde58e4782c5308298c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX89G2562885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1599363707bea28bc6181a4d8b1a0fb8ea3849741661b75d0b51ad7fcb7e4d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CBF8B2481023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef3f71bc0ff56118b6322f5ecd90023f9512b573b8e3a43f651c000301d8dcc. 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/QZFZ62417823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261b12356d2bd6021c97997fddc09272e579b8fe9fc8bb7ab0b044fd5daf8661. 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/CALVP2433707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b1c8f0008e8dffa59c8898b26f6cede8f524de7d02be319e6f939dd2427c38. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZZ762468574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7169fadcd1b394e7bc66854e2615a2fe001a176121cc98ccfebb2cfc0570c634. 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/QZK6G2496959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261b12356d2bd6021c97997fddc09272e579b8fe9fc8bb7ab0b044fd5daf8661. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CALVP2433707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef3f71bc0ff56118b6322f5ecd90023f9512b573b8e3a43f651c000301d8dcc. 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/QZFZ62417823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949a7b4522b0df9ced5195cc3448736d3bb2561dbc4d34c1768c3a9ca5c96b39. 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/QZTAW2362853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6428133ec0d52655e09aab052a8b3724b7b99cd0e7b73296a5b7f2eec8e632. 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/UKZGC2407775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dbbca160efcc81e395fa81b1418d69c5b40bb80b5e424a0f1a3f81fe63df69. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/UKZGC2407776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0e5212fafc5e6b663e51a8abb39b7c25889e3ec56744d78b19f9853cbe684bb. 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/GBKQU2472586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7169fadcd1b394e7bc66854e2615a2fe001a176121cc98ccfebb2cfc0570c634. 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/QZK6G2496959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef3f71bc0ff56118b6322f5ecd90023f9512b573b8e3a43f651c000301d8dcc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZFZ62417823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949a7b4522b0df9ced5195cc3448736d3bb2561dbc4d34c1768c3a9ca5c96b39. 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/QZTAW2362853.