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 0x8c5a42e0e580723c4c5c6c4dc51bd8d0b87a38a1a131c9d753e0afd9b4e28784. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f113bfe6-ed2a-49fc-b0f1-1a301291e973.json and https://artists.proofprofile.net/proofs/artist/f113bfe6-ed2a-49fc-b0f1-1a301291e973.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 0x4bb2a8d3bfca2c31a01fe85a897fff893efd4244a16fe9b95a3ad47fc2114d3e. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FR26V1557768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99441ff9f1fb5fafa6a6e87244ec38c5163ea4d0580efd8459b4e3fa8cd773c. 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/FR9W11712002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd75274023e7a3dd66bbe7dca42f94bfba1a4b6f5be0c699e44d01244f16834. 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/NL1AP1905269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fce38d1c7a4d5be53670b7ef6616c07e3b107b9e12467744bc22e2d44f4913. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/NL1AP1905273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe2741c21fac437cb59201658ff8c45c050acffe33300316eedb81c7210cee0. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/FRR642001310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b4546097197a7c552e7b7b997ab8974859a02886f07abbbfa2835ac6c9d9ed. 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/FRR642001716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae62ffb062dead3b0984a99a7303838cd0e1535dc3163211d3ee2532693acbc. 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/FRR642001721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24ba0eda7d42d502f23a29dae7fb63b5d27a0f18e43894bf7e478ba8dbc49e5. 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/FRR642001722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070f3a1593608e3d24eda44f3bea9caba75d95aa1c299b09378585f6c7889809. 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/FRR642001723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b4546097197a7c552e7b7b997ab8974859a02886f07abbbfa2835ac6c9d9ed. 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/FRR642001716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7e0ecc3e27800b6981ca8bd3315be6c7c2bf98295354bcca87f0aeeb6538d1. 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/FRR642001717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe2741c21fac437cb59201658ff8c45c050acffe33300316eedb81c7210cee0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FRR642001310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070f3a1593608e3d24eda44f3bea9caba75d95aa1c299b09378585f6c7889809. 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/FRR642001723.