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 0xd1c964dc7aaaad9918bdd0b3ea4647ee5afeff36e0cb6ef2b4bcb211bcb15fd0. 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/ca440f70-e8cf-46fd-99d6-3b7c7ffc6b32.json and https://artists.proofprofile.net/proofs/artist/ca440f70-e8cf-46fd-99d6-3b7c7ffc6b32.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 0x4c056740ec70999dbba54393157f61740fa801ec31caa0967233ca60a009af3b. 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/UKEX32210588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc61d4fc5c7f5bc53c546d7479512f0794d52efa7173de8e29c82d356dc826b. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/UKEX32210590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3407946556360f8a6a71095a8c03ce16343dbe4b61d7ddc024d43806de1538ec. 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/UKEX32210593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e316e9cbfdbfb867a7f9fc79e65fb9a50a65c21707b31c0dbf8bbdc93d3372. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/UKEX32210594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6d65323c8e7ce9b406bcdfd78619beaee4158d9827ac543811ea69aa6ad70b. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKEX32221459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4211517bb452baeed1c9adf68d5d9d9822810dcdec58354c71968d077072f3a. 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/UKEX32221461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e93d89dc7164bc3dd115340b5aa74507f29b48d0c4503f6c4e1878e72862e5f. 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/UKEX32221462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bae92f6e1fdb29880a4eef3522332ce615c9e56ed0f4df4bec9c7723dbc627. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/UKEX32221463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b16b5a00bf695e39b277cfdb2fd4b84913e86fcda5fa8f100a759a8652e74f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/UKEX32221464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285a3863867c48824cf620997e46b8a7ef3006b8aa9dd08d5f00a60f6c3cd541. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/UKEX32221465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a28a2e66b189e57b8e97e573a5d1868a470b711db7e3d383fb06a236239fbb. 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/UKEX32348838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3135a72220cd65c5a6d2bd5409e93a0e4d93e3bf41740cb50be08a902cf56c27. 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/UKEX32348839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae6554151dec3ea1bb254e6361359df439899f2392660c86b9c7f1f5977bc10. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/UKEX32348840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b948c3e65a21385c8be4920ef0b6378c3dace7f7668c4e6d95250315debc1f. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/UKEX32348844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae6554151dec3ea1bb254e6361359df439899f2392660c86b9c7f1f5977bc10. 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/UKEX32348840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cfb609b66ed8525272552e2ce9bbec9779eefa4ca799625af87797c82297fc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/UKEX32348843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b948c3e65a21385c8be4920ef0b6378c3dace7f7668c4e6d95250315debc1f. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/UKEX32348844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c2f86236de66286b0016634800bc98de17f0c56c9ce673ba459c66a2939329. 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/UKEX32348845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadcd317ee968e0eeba97c5812427f69d95791fcd04e80941c579be92172a51c0. 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/UKEX32434929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60daa22ac55eb3c309de5c13a5cb04ff95255ab241dad767372ac45b8884f775. 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/UKEX32507591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bf34153abe8cf3b0fbdf7bbdaadc3597501d416396af6dac260cf535e7ffda. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/UKEX32507592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bcd99a482092ea44fa109c61c5b6a7afb16e82a9fb4c3885a79f702a96c806. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/UKEX32507593.