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 0xe04bc99fe4cc399ad6b34302d0142e88edd7af9e3893fccf541b4fefb6155f25. 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/839d4adc-105a-4b63-8215-3238c0084fc3.json and https://artists.proofprofile.net/proofs/artist/839d4adc-105a-4b63-8215-3238c0084fc3.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 0xd28d09f9ee0442c93dd8ed578e75bfb3c4d5df3d37502ae955c8e965b8e912f1. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/CZA210000096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737b9e1f3ab262cf8ec1cffc23d52b5e8455bd1b1ebf92f07d5b2e9a684efadf. 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/CZA210300147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250ed1fb3432205b30cb1a9e44b595ed348eb63a83a5e87a40db771f56b604ad. 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/SKG971400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa617a0a9348c497fc5061c452cf8c403a949f248965369536424319147b297bf. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/CZA231700135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf67062d18f9eaf3f0469090a4c4fd3776be27bace5766f0fa69d04ee4401953. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CZA231700137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6625c301e1ca76303677794ac27756e0f87398e066c6736add41b5725c4870a. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/CZA231700142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5217d0844b1dd6a714d28e4adfe895d3d24360ea3f3c926647d42e1b182ffe77. 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/SKG971800107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90251bb821ddbfedcde1d7a6fdddc58dec3358ceebb3d056649a5acd71349a79. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/SKG971900101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e13d6a92c1f4e232afe07bfc887cacf31aa00f86a355b7f5b096777fa4d099. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/SKG971900102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc1c2efca8e87da2294a190b01787862a7316399b8e9bea69717d64f7d95aec. 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/SKBW52200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d393f7b71dae9f5fb40fb9c3965b8d7c0a16bb46f5e9ec61567e2b958efa26. 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/SKBW52400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138e4622ac882d689f75b87eada7eeee3fa0f4024dab5640a516491946694906. 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/SKBW52400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6316e3b4860669d96c5ddffe7bc552721fc3fc58c5aeb5c7f68a38cee3976f21. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/SKBW52400104.