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 0xf942279ca9a0b1722697eb4af6c6d024b9f7a555ab586902ee863b499b9827b1. 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/47414d54-3cfa-4044-9322-3c6c01a57cad.json and https://artists.proofprofile.net/proofs/artist/47414d54-3cfa-4044-9322-3c6c01a57cad.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 0x621300349858a8ad54575f20bf69993944c658648c014f9b7ef124298d4c1d58. 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/PLF242108523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3436b786448a438132cf9b618143d2712cb1eff2d28f7d672c1ec2badf43eedb. 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/PLF242108733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b00f93f0ac70dc078fa778830a1d65267366658dc76b74108edbfe2049ff81. 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/PLF242208928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd8fedb06b007b652742002d76da1ff44e811b451ca5df3dcf733de56b0b225. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAIA2411496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdd543237f042d424a30573f5b9ec614c5803b38e69377917ef8f50317b5d0a. 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/PLF242209661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf03e41d27a64f823a67255954324ee9c345eef1b06f530bc3d51df20e87410. 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/PLF242209332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b55becec5c69f77a84a48608948682c658cd195b9548b35aa181a25b300519. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/PLF242209822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9bb6d4e0a7f386181c9bc03250d213ba3416ea914de1aaa868c936e1a8b5a78. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/PLF242210326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cedb1247925410fef90e04397d4685221c004edfce9eac9540f5a734201b16. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/TCAIA2432556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ffd48aa9e9d0dcdb445e288034fdcefef8b65368dcb510ec99e7108919e9a0d. 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/TCAIY2459418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50a6bdf943da0a25fa0831b0f1a261b5a95a89545f582d654db2775f2e04525. 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/PLF242514902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd8266e6d00bf0ad5c4ccb3262c4d7d277015e88035f9e44506446dafd8f8a7. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/PLF242514904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70536c7176d6126fc607b201d038a1d9fee4c88359d71a1c02e47dd245e486d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMDA72519637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0da71ff7e2a977a2f4230b0f710dd11cc619dca426ab150cbc011f6d733aba0. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/PLF242210881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf141d24f66aea5056731cd4d94232ef38f793f0cf6d82383950c34873ad5e004. 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/QZ5FN2125163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096a60303858b441e74f4e7ff9092bf8b29f7e2d36c0c20e4b7bb1d7ffa7b0ce. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBWUL2049340.