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 0x11295eac456c664afc349f5b46d754854e3686c0a59762c56b0e8accf439b907. 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/3c517ab2-3bf5-4f3b-a695-a8a7a8de89d4.json and https://artists.proofprofile.net/proofs/artist/3c517ab2-3bf5-4f3b-a695-a8a7a8de89d4.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 0x9d5e8af77b68e9305dcb8ef79a5049fc1bf1f83659f143f0c661b4986d6a69bf. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FR10S1417337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfa6f300377efc5a0f473b774c1334e42431aa5ce2cebb9202e1f8caa99cdbd. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/PT2EO0901205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace17e0bff8583b10768d85174047acc84213068c8bc873bbdd9098777395088. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/PT2EO0901215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6d33b84fbb5616d5ed0f660ae8e1faf0edc1bdece5cfaf2ef36b258d86dcb1. 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/PTES11305205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b684bdc66cbc526185a8b084b0b786f83a42f85e3355ef922d93154fdd098d. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/FR59R1749308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa314c8c870975f968db35f712baaf5e29a4c61e2135fcb6f174173778bd230e4. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/FR59R1749310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce65c22fc4e662f030e1ebe68884527eeece256e2797e06c8641d728a062ced3. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FR59R1749315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55859c21bb709fe0d93f7b91cddfee4448e7083751e891c9bda7cfbca8983dcf. 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/FR59R1991971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29329599070fb9f0035477a4d1fb575e0742a481163b850a4cf8864b158bb2f5. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/FR59R1991980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e7d85b5182a68acc38093712eef5d3cc016ad826b8a2c14cf1023003b4b547. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/PT2EO2100445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906e1f991a0bcd917ba67375464dd8baf1a95b7a9cde8d7b30f0df20362529e9. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/PT2EO2400064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e639429ed978ad3d5d3d897e44d92af25beec682f02fd0a0ba7e3d09677abd. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/PT2EO2500371.
Italie, Espagne, Portugal, Sud Ouest, Vol. 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991d160603ab1017cb4788f18356665dc2995a0916d59f44467f156198843e9a. 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/FR80T0600382.
Italie, Espagne, Portugal, Sud Ouest, Vol. 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f311b71c2bceddd760a33c2a58220bb477e7d024437c42e92bc9b8c9ad204da. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/FR80T0600383.