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 0x149bda0813acb5adeb2de25ac98bf52b468f403e0ad6a6fafabc146c69982fe6. 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/e70c2fd4-8b85-4136-91a1-bd582d9a93f1.json and https://artists.proofprofile.net/proofs/artist/e70c2fd4-8b85-4136-91a1-bd582d9a93f1.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 0xcb528dd14af4d134a15a3bcbc23c7742d306f17f48d184f7ec6779a5b85c51df. 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/GBSMU9352845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf985749551437340426933274ad14d625a0e4a35c5bcf00a023d039bb855f053. 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/GBSMU9352846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec9045cac4b99cfdcd85b542e3af5fd6e0a670012718b106792ab4a3645dada. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/GBSMU9352849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a46713004fad9414114260332e9db40d366c9b4c8d7915d59475d827e43947f. 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/GBSMU9352850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64e888a49964ad2bd2a41056e23816b4a01e2d974d296bdb2cfa74cd1b5e7ff. 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/GBSMU9352851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2846a0ce98d94318c7206a2c53930aacb6077042e2451f3a3add8dd40dcf1b. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/GBSMU9352853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7655774e557fbe675fcd8963c60ddc491e11e679c658546d5bce6189843c09b2. 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/GBSMU9352854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7d7b2d1be6de15d1bd9640dd89e09bbea2ad9dfab5edbd480a2ea90125fd23. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/IDA567140119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04efdb51817300e21b9ec9acab4a1d2647337bb1c30cefc8f6dfecf0070aeb3a. 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/TCAJT2574689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1dc4619805fa8664939cb3bb539f37beed204888047586a936b6b6a02b0af3. Chain 2 (Bitcoin): anchored in block 957717 (2026-07-12T14:54:03Z), 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/GX8LE2322590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4cb013475521d98719a0e806cf2a7865fbc660872f1e484b589ae1b13266db. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GX8LE2334768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c548ab6926cde0c29eb5601e8ebc54e015f3b6f4dae7714fd9561ea7d7645a. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GX3HH2389809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c548ab6926cde0c29eb5601e8ebc54e015f3b6f4dae7714fd9561ea7d7645a. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/GX3HH2389809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa292ec9079d7b89030bb5574aaca77fcca1d37f6f3b91de956f57346a38c4eff. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/GXBDT2459978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69f93436c7b27fc59a6d141591654deb13e51bd31fc968b7fc95ad7e94a1f55. Chain 2 (Bitcoin): anchored in block 957720 (2026-07-12T15:26:09Z), 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/GX89G2578432.