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 0x95d114be03a0745be647885eab9368086e09219725d043a1cfba0241d6247e0c. 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/fff26f67-9aa3-43ed-9913-0f774ec6f7b9.json and https://artists.proofprofile.net/proofs/artist/fff26f67-9aa3-43ed-9913-0f774ec6f7b9.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 0xfdb95b5d1288d48c66dcfb826f9afe78d771d741c541ed6b6617023b4b6addbc. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/NLB030902586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff291ffb03df7e3f731cdbf0ec64de551dde94822f19e69198fff9a6d5fb144. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLB030902603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556571a59d989a8a93f865e79a897db827fd6448ea56f15e9bb281dce597148c. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/CH0202213474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f0d54b772df3405583a6d07da2b789f1a7fae3b0149d1dae799c3e6b2ed07f. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/NLE871082907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc6e77467c983a5d0865701fae407bbe8d7de913ab0167d8837f68e91c1d96d1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:54:24Z), 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/NLE871082912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1748a7d2a41d75fc87a8e4588268dc72a6db8dc8a1dac21671ed5300f9ae29. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/NLB031000927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa71a417b9437fe3be56a4f7ae3c2cc967e47c6e27c0cca5750f75cd2d3ab826. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLB030906583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801b896d7792996d5de51faf85da78407eea7e42034a0cf371cdbb3508214c58. 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/NLB030906585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbac29cf2dffa25fd47f3120a983d0b4dc79f36f58707f601cfd3fc40c6b1f8. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NLB030906586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e7a9b80530812adc31b8af1f9f01e9b16e586763154db55540e768692bc1ad. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/NLB030906593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa495ac00bb6f6e8e317b2764eea1d7c63d885e0a97d3718ce9deb369f21dab68. 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/NLB030906600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc588b618df53775eeed2ca6d9b09beae4ca209feef1e80cc85dd5d68e5e6ffa6. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T13:49:12Z), 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/NLB030902693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd36b29bd513de054f304e3cbc8655a182978713eb6f476fc0dc87b386d64241. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/NLB030903189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b46d81c1b83eaed02584cbd633c1129d12bd363356e1c75c3ea948a53056fe0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLB030900340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6d26744797f8230377d318a74814759d099c832d7a92994769817d2fdf1957. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLB030902388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ecdb5ed38777527d58780091f7c9249b9490b88c8051591c682f9d50c87c4b. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:34:41Z), 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/NLB030902757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab194c35e633e6f1feb9afafbc0dd6ab62f3f9f00b568aa6e6f1788af13f62d. 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/NLB030902397.