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 0x53ea0855bae5ddeaff59cc415ac52325b6b5fb53a9bdd89c1ba4310d51857216. 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/05992306-bca2-4d92-a058-d6abadd4818d.json and https://artists.proofprofile.net/proofs/artist/05992306-bca2-4d92-a058-d6abadd4818d.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 0xc7d2af236c079ecea93cb62737d53ac144ab2302cc7d90aee4462ab169ef79a6. 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/FR2X41720150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642c53a9887b6368ec19aea563511cdf7e4ba91dba2c5a8688d906b08b345cb6. 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/FRX281708177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe8fb32f4a1c4f30fbc1504251647ea0e5f7c7d3dd3d10e62e30b6711ec2f43. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/FR96X1884039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296fb825ab9f0cd2225426cdc4f61abb6f263f298063e57dbacf56b9a09428b4. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/FR59R1997736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cddebce507b09f9c1ad957153739802d0bca860eb5e767b88c150725609580. 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/FRS182150839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce16b86466fbcba91ed3020ef9bddc2dc4dbdf9de8130254fa05b355dff41a6. 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/FRS182137099.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedb5cb9f9fdb41be6db94c3d4d88b5b9ccf88626ee1a0b5140eea9da205f2458. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FRXZI2000350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2382680452212ea45b4fc29e294967a2d3b6e9a442aa83ec8a272d7b0a9d1c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FRXZI2000470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4abe0484e3bc29cd20735f0aa67fa23c8856458a9b24e146a418aab3ef5d9da. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRXZI2000160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6786559ed81c87ef190eb74cc4875b81ceeb8734ae603e87e7452a41aa7e395c. 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/FR0U91500600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cec0d5f47f78d8387ab7affee9e0f2aa869925c78107b599d11e0484fb4ec4c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR9W11611316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1da68813c0796a64d91c9a826957631083c93927d05e0f910c3ccab5f0e8f3f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USVPR1800076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0580ca26c1f0365b474a5d240a937d8cae8fa9a4116da380c31aa5a002228a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAGU2300290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0580ca26c1f0365b474a5d240a937d8cae8fa9a4116da380c31aa5a002228a. 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/TCAGU2300290.