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 0x4bc250499b088a530b72b53476e61967457f11716136064150a5fbe830255968. 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/fce3a05b-889a-4cc2-8af5-9d0bbfcffb09.json and https://artists.proofprofile.net/proofs/artist/fce3a05b-889a-4cc2-8af5-9d0bbfcffb09.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 0xa9920834bdaee0c0249622c2e4cfa86515fbf003e017692c2c9d1cd40c6bc334. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USANG2285607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f90ade02ed5932be0a56534304bd357c75af40a6d4c1a170f39325cd02bcc13. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USANG2277723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f3ad4bad657ce0059ffdc6f8b407cd075f6ca290d9d7c0c4a01e5a12bc2d4b. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QM3DF2295008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce45c2ecaceda0eca3d94685164f7ad0a9363380e3f04bdcb930b933ef5ba6c. 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/QM3DF2295011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed9995a2c89b485b87ccb97cbb0b56c531ce0340f119233b1d095526449afcc. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QMANG2225265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe665550423551641d82b0066ef476f1697595b417e9a69cb9805e112d8073cb0. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QMANG2219382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69df55be8bf1c6a457700d60792cf10107c1cf521abce9f63151fd8a3cab82ae. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QMANG2219383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0772c3524f4be5bf96a1c137fb0b972f579ff7b6ed52458b423ad8495c27e5b. 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/QMANG2243841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf53cfe3942f57b7f748af800a13684fb0a28f3d377639124245835e731e682cf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMANG2244956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7705130dc1a2a567cf81f1245b9db04c0514a8fe35df52040f0bbcfcf54983aa. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/FR9Z62400399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a0f498b852a7d0e4de511cd0f179c0ee2c9490fa30af9cab9c96e1b73101d0e. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/USANG2439605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b69b0ff8bd03143b555dd8db949f0266b0bc5d4fc2718902a05af2e65c7186. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/USANG2481363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80bc39af75bfd9687150f794ea569789e861f180de092ac5c7fb26ac4df8400. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/FR9Z62500419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0adfe1943383eba3752723a60fe35316785e8840aa01298dcc72bf4e5283f96. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USANG2502695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea24c821b1bb8776e78fcb9ee3faa71e04099a88f0443f832b0dc13e6eef4f39. 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/CH7812543243.