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 0x91f850be46fda93980e4a6ce36f8afc760cb32bc4788171a45597485d1bb6296. 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/6a003ed7-1ddd-42aa-bc6f-c263e3a7efde.json and https://artists.proofprofile.net/proofs/artist/6a003ed7-1ddd-42aa-bc6f-c263e3a7efde.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 0xd4c473fd507f0ab674823030570a001ad446e327109ea995729b32b0baa3df05. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/GBLV61715879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7deced835def06ff04e80c2485daa944d31d6f6c35efa68ef74f3012a15fb24b. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/GBKQU1859962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b6f9652dbe11539339451167f0b1fb67433e307f17c859d054cfa756f51400. 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/USLZJ1838837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadced8f2c6b6a88a45175ae3e651f835a37a4dfb0e23caf23b064c6bdf0f268. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/GBKQU1913117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01b627874913db85151968860dd968d0fcc3dfc779691ac16b3258bcfe0d105. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZES51938461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b316c0ae2220254aac4fefb01a35a0ed78c391959aa304f46fe25ecbbc212c. 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/GBLV61929802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0936c34bd661d8ed8a0eff3e984fd3a61eb0b4eb0dab61e724b7d885f23439. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/GBLV62006334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aeeb488d3546dfed2b1e85fcb8f48c015a370bb62e6e8fcf4b22923ca5b9aa3. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/GBLV62006335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000c2cddde3ba4f5183763231a11ffd88a421e0082ebd7a4994d09cb2a15744c. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/GBKQU2100816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc22e29a83c0f7a01112727de673ea00e5ab75ca57645c82d52aa2e5bceaacbe1. 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/TCAFR2119754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774bf9d7a244abcfc9cfd3d4641850d4852425a0c112de589cbdfadc10a69c39. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/TCAFR2119756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9598fcab2c838371ebe922175f6853d2beb74caf6c8b4c1a9a5f27809609b3c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAFR2119768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898ac2e310e63e002b7d8487fb1269151970af84bc1f4512cf6487ccc48fbbfc. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/TCAFR2119814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0573c7f67bd7c9f32984ac278fb274d00c38bed4b1253c5c89ed4f3632c24bb. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNWZ2181222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f62987ed79c4949c332992bcb3483d6deccad6dc353585cf54c3e082fe71a8d. 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/QZDA62324655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112c7c27da23f764e3edba5a0d2980ce3c41e9c73a2bcb7cf5827ce0f0abed72. 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/QZS642402770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3390e125a8b9a775b78bd1ed71c0f6f831cc1688e3ab3a42b7dd6890bf52d13c. 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/DEH742419233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c28889bfb04c919e545af24c4880522a4203789a6ca83298cbee8f8ef6246d. 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/DEH742419234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a52133878872f919fca7b44e2c670d55e392f9c87583559a1974905f01b7a7. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BEFWX2011516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6e36e8412eb4f895b7cd70e390431b23ecf9ca3fe18b059087160792d803fa. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/GBKQU2052771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2bb2f0309aa418317da2331013a4206e920a2437cbf04bce0dc8c1e22d6ef7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBLV61900043.