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 0x10e4e047cbcd30ad7a9ed2b300da4e4537f8831355e93130a2f73d660ab7de5c. 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/b33becf7-fcbb-4bbe-be5a-336097a022cc.json and https://artists.proofprofile.net/proofs/artist/b33becf7-fcbb-4bbe-be5a-336097a022cc.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 0x41be47a4e07bbce4789a6eff81440feee1db88c4623cea7a661f3061249d744c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH5331700371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184c0e78e8efbc4f66f110cbebb99179f4617c19d1ccabc39beae8241987b8e3. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/CH5331900390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef53d091f450e3a8fe1405ff9c2298b56152eb2b6ce44eef01df7330e7436ec. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/CH5331900391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907e091e128fbb2478464e1d891efb087a7f1811cd54f957d48b743aedb5b306. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/CH5331900392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03391f10d2ee9da265edc8e3dd97527db5e51972101aa09437aa1079252fa27. 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/CH5331900394.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932ea32803c42dcb1077d12e8571d0a68089899cdbb013abcbe208310f454633. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CH5331900395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0abd88a2e47502a9842e88c8a792d064dea245a9a2fb2535d89f74cd75d805. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CH5331900396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e228a7394c2829fee2ec88cf1b7be08b3fb7fca7d3b1481568738cc8a854974. 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/CH7811501690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191221e556dfbea703480e70c6adfd79fd63855a391e6dddbff1d5295bdc1dac. 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/CH5331400041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f2a70d4e33c8a14552f78c9448b46c7ac64a62b420a8d9a08ecf80a20c6dbc. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CH5331400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa971d8ed63c2b91d39327132b129a46805e4b00065bca986188a1218d6bce35e. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/CH5331400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b6aeef6edbd5a0a0afdacfef16039f72d8cc75fcdf9763d06ce28e02713d8d6. 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/CH5331400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558beab10bcac5f68135e3c67ec7d21851d841ca79d3ba315847b8c839dd207a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CH5331400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94fb7f0f335f9b0880029296fd4b44d71733d0918274923fe755dac0004ee16c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CH5331400048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318ea76816a0b30b38bde9b06f593fa16a41280fc7a7f2682adf98be46906b36. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CH5331400050.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60394dcd4c24247c0352775e7686d74a128484c26a8a12a84ef1a43e13c0113f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ATB842000094.