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 0x660f794998730f97e51a70e5cf7f5edeba846f47f6d4da5cdb49dc279f204a8a. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23d896d8-3e8b-404b-95c3-3be4c8eba579.json and https://artists.proofprofile.net/proofs/artist/23d896d8-3e8b-404b-95c3-3be4c8eba579.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 0x1e331d3ed760f770b6815956bb9f744c5a6fc40e12e57e9a6a61818d0573b034. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAJH2581846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f30421e949632c20ff3ff904a7830981f7494622a9514e81a54e611e9b304f7. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TCAJG2581895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50589548b4f2b438ef3241c399cf2b45e2014b17f626cd698f312d78ee1084ea. 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/TCAJG2581982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb614f97dcb016fc8bac57c563e51e8a8d6b735f19036ee19001c9558ac8e8cfa. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TCAIL2491187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6ce1c766fcd6294cd5e962a81302fe1e4faa6368c7f6445c3da4ee84cf8ea1. 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/TCAIM2491206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5302beb2e5a6637f374fac8cd8b137855f4d2b8fcd10ecc284f05a22c49a7ad5. 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/TCAIL2491257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2a19e26eb801e80b856d19c62ed9612ef3fd4b7b29c5e4bcc3eeb1e80874e5. 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/TCAIM2491279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29a02561ad7321ae302e38ba87afade702d2cef429bc4c10efa3952bc1b8052. 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/TCAIM2491281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c46f8603f0dad337d27060e8faee0a3a1d019d6d33844a26a7949609a130f5. 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/TCAIL2491285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912283526c96ce9ffc09e711d06b3f2e78067a28b8acb8997d289cbfe8d7d5e6. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/TCAIE2417515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc37a7abe6f9f899677898329fedd3f8cd26f7cf78c28cf6ebb73aa723f6b54. 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/QZNJY2117919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540552ed6ede51632af0e958c43150be0816ed350a1bfd35ca3d8374b46bbaad. 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/TCAJF2544739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a2e0bcf978d9fb724e51c772b92921565ba37ff13c722c70469f49fc2ab860. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAJC2479932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc3a12b7c882e13f436550b1df0e08e1f675155ec56ef84bd2bf9f80b125d28. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TCAIO2418553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292ff54374895d9677eccd39fde147c52a852a8d5907ceb374c92ff5923bcfff. 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/TCAIF2435864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912283526c96ce9ffc09e711d06b3f2e78067a28b8acb8997d289cbfe8d7d5e6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCAIE2417515.