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 0xf20a7a11fc1e2efad65096209c4261b250446852ac236d4fa826b772ea50c9a0. 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/c031c785-949c-47f5-a048-677d98137602.json and https://artists.proofprofile.net/proofs/artist/c031c785-949c-47f5-a048-677d98137602.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 0xd57cc61e712926ffd99183f0d08b4aedf8e68abe9010d20ecb4125021bcca122. 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/FR9DT2200870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5228b2bb3c7b3aee99280482d34cfbea420e66f047c7e7c62d4f0f194ccb7e. 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/FR9DT2201120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408ea9a21aec2e7ec68ac54ca2fb5f386313f50e3d5f45cbb2ff12fc16a5e526. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR9DT2201030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a043ab60f4fb0c195a9f3cfd632e44e57d48f3d41b92b1b34c564070bbb07b. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR9DT2200880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c728996dadf9b7b9bd0e39e86d60442a54e9581c6e6e912c73944b15093559. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/FR9DT2200890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c0d6681f4c014afee87f92de544032c8aef99b5945bf0c80b05d8ac42cad8b. 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/FR9DT2201050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819d1ad4e5004212c2844c8df5a91af0135ef66a7316ee1855366eee1b8ec0a8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR9DT2201060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e45c7ae8cef8e762d8ac6cf3e9c1d79c2cd941ac341cf85468f341422a9b654. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/FR9DT2201070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48c61ed8eaceb175cccf76e6b65835331cc07b0a70edf5c87ab13f5753b38414. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/FR9DT2300800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6ea3a47b6a6ad2602a22bf22038bf0668faac761e258e55acfb11d86379e26. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCAIC2450349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf023d86f6cd6a9a90abd139db1c3beab08a8a33795e6754fb2bdd9f8654a4e99. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/TCAIW2426285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e9386d2895030d66d55fadebf0529099bb54d78d8e471fbf7e858563d83c5d. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAIW2426336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412b75103e9bdd19192cb0949d50474409cc40e266b6fbc5b4b96a9a05f57ea1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCAIX2426416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c2e8673a845e6c0062d62ae9ea35964523549ff5f395680ce65c12dc168898. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAIW2426460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e95a1a8090d36965370692583db716da522d7cfd974bbd5ee0d698d2361e918. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR9W12322295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e95a1a8090d36965370692583db716da522d7cfd974bbd5ee0d698d2361e918. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/FR9W12322295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e95a1a8090d36965370692583db716da522d7cfd974bbd5ee0d698d2361e918. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FR9W12322295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a774421657e2c75c8f0b8d0425cdb4357915eef8766191fafb1b8f4b7197b3. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/CAPGD2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a774421657e2c75c8f0b8d0425cdb4357915eef8766191fafb1b8f4b7197b3. 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/CAPGD2000019.