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 0x9e18f058257c781df5308857c8d4b051a7ce968efd5d3bbe4847931d82cacbeb. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37de2c72-00dd-4ae7-a6c0-e64717ba0bc2.json and https://artists.proofprofile.net/proofs/artist/37de2c72-00dd-4ae7-a6c0-e64717ba0bc2.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 0x1795664ec8f3cf1dc3a89b8ed3d78d8b1d6dff348ff7bb9e64f23434603422cd. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/USL4Q2403849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ece75680b6e3ce473bdcb79c4a56b6e02da9ff3596c7a6eee7283753d42ad6. 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/USL4Q2402885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53cfb7decb8144c1bb0f21461fb921d917de46adb80cb035200e3a930950472d. 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/USX9P2470745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48be3eca62d6a26465658e2229aab7052612596c7961910c09c1f3a968e4f0eb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGH2527768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749f6f00f8b6d8915b70979e5b0ff6b05ec247115ee7edf3ee8664e16cc9b286. 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/USCGH2527711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ad867b9763bc87588e31034d1129af75467e4ed5a8d5de49453447f11b7ecf. 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/USCGH2527706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdbf5218b03c45ce5ed0a48d803c86bb9d46283ae18b07eb431f673c36cc370. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/USCGH2527707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b9b588645db42acad796bb0c8d4c59e7d778f7805bef30114b785cc88f3fae. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/USCGH2527708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd882f141f7d4e9592c9b59b03a27fb7473ec34224926692fa8fd56f16dfbe2a4. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/USCGH2527728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52d4ed4a47745b068fdbb4bd5815ee33c8c0879c764f3891aeab3aece63e790. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USCGH2527729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed85268f4f0f104a2e38b77be69c5dedb44d38a2ad6a407b8ee700aeef016e3e. 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/USCGH2527730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786618d9bd46d5a6620aea84f604b6515d43cd44c85659e8207049247f1d7c01. 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/USCGH2527731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8096894dcdb76612a518c4799d3578d149973f8dbb1f0e5bd7c5a013763006. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGH2527732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7822f48b7ad7cb0f777bb72e69b6c44fa9b88fcc035eb6987278504ec8b9e04. 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/USCGH2527764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4430722473946e155a74744536238621103823726539722992ce6d56bf1a1698. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGH2527765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2fd3fc907b368688dde1f75c94bfe03722ebd53fe65151eecd2ac97e81bbb9. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USCGH2527734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0998f0148cfd4db09a34c5501756ee2c974a60c53f5fccaf741ba3c87b0ff3. 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/USCGH2527735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63d8c8118395da1ff98ce99b514a8dd0d8d0fe276e201c73410e020f25343ab. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USCGH2527736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f023424239c5a2492fcec95c27ab322d2de9a62a7f5d5ebe1df586a51a00e7. 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/USCGH2527737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac451f93a48e028e61c63ec34bc13c7d03722c39d9d94c813f8aea0659cb8417. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USCGH2527740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd245f590e6dbefa79c3d93c3f677c45c98d87d099fa89313ea5159e0bbfcf3e. 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/USCGH2527742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f13b80d617f1cc8c0f4bd1559dab7727c522e253257b882253b6fb1b334a564. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/USCGH2527743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f84fe2247ab37be069575ef1371aa49b90697e66629491a649d1e767db6cba. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/USCGH2527744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe750a6553d098e3f795ed81d565256f327af718560a3790dc681cd5e7f80d702. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/USCGH2527745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad29c8fa5459eb8b210297082c57a213dcdc1645e5590ea3960e2d13a212e2e1. 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/USDY42507588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3096d70958135cb2dd4a46927b23ea7ae9c8b648598a33195b2fabf138da4e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/UKZGC2502290.
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