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 0xb38c3e7b6a7d53b829544bc9a4f23bd99ff9a4b3a40d787f971c6e2748be8457. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a71c7cb-e663-48ce-9307-b02972a3a1ff.json and https://artists.proofprofile.net/proofs/artist/0a71c7cb-e663-48ce-9307-b02972a3a1ff.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 0xeee336a96c142c785d34037f6321e2aefa27fe2c6ab2ff4b339f7bd6877b7609. Chain 2 (Bitcoin): anchored in block 957244 (2026-07-09T01:44:02Z), 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/NOUR61301010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ac5ce574a112cf2b7e5aeaf7d74d7010bef7b305f0a94791789dfad8a09eb5. 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/NOUR61301030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74bb23f1e693b617af4ab1479e1ccf45e8c5dc4be9328a3236f608ff6243971a. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/NOUR61301070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af4377c55a2b482ffc8983b4b6e9545096489054415cc3622d67e418f1a75e9. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/NOUR62402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d08ad92e4c90bdf12c1be8c78711274a102d63722ad5b24cf13a96dcd63e482. 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/NOUR62402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x466042ea3fd0ce450567e2ab31e8c92f4ef20cc9839039d08ca1a4448c70b656. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/NOUR62402030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa654a62eefb6d273bc666b0c77d8a166c379651812e72c327b931bb27876821a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NOUR62402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5b0c2b7a9d0642a7b496a8e459147bf89cdee31950ca87ab1e753053d94070. 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/NOUR62402050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919bc6f9545d9e257c8c0def8c55db1f13cf1bf8eff408f54f0397deda5f4709. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/NOUR62402060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa214976615079c15bca74ca1229540e849bde8020b96630783418517cc3355e2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NOUR62402070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf537e08213987a86ccf230cf5755e30a95dc522642fef86d828781cd27bf2638. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NOUR62402080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a6a4d707e5cbb77cbaf6c1c3b27e8c08005da24c709dbf912f9e8e806c9888. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NOUR62402090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e177d8647ea0cc02c4314ceb96093c461e362c23d668262fe2a95bd0611a9d. 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/NOUR62402100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cce096ccb0f2f2975e9c9afcf5b91f7a784e5a717a98ca74e8622350f692012. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NOUR62402110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0777992d3287d70c8891c5506fd40733ad15723c7cff6b2a4b256068c7354ba1. 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/NOUR62402120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe100f456f5880c520dde42503ed582d638bc629df9a3946454a9e5455512f450. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NOUR62402130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81a4af9d10d9b92a04d4007e0c4fd0b846edc78a1c23b0cb8ae65d347780102. 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/NOUR62003010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc7b20e2a60332730b18d3e558588c27fa038789554412ec708c5201ee8a6a0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NOUR62003020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35a6a3f1b9b9eb4068996f8e9aefb74b3985fafcf819f936a31872ef22ae3f3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NOUR62003040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740d2df680c1b2e04430223417befc2f0212b673f6c616c3be67874ab8d7dfd1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOUR62003080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678bdbe238629c5be68c7aabd5fb1ae20a411b177f7f1101fed893c402d49a1b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NOUR62003090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af4377c55a2b482ffc8983b4b6e9545096489054415cc3622d67e418f1a75e9. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NOUR62402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7122e7f07c86665bf7aef9c6e10d5cec30ffe0fd8f77810e05031c5ff051afb7. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/NOUR61802010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4764410bb989901260bcceb0d8c6679ed53c63eebe1b3a43c28f465f463825a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NOUR61802040.