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 0xc4c8ed5a066f5749354e8ce993c7e690057dbbc3cf8e5f04db63b941709e8c17. 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/ac25b5fa-812f-41aa-a37f-fa2bbd6d62b8.json and https://artists.proofprofile.net/proofs/artist/ac25b5fa-812f-41aa-a37f-fa2bbd6d62b8.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 0xd700f0d92c29ed3a344d70ada944cc6769b765555e31040fb9e6d6fd033af317. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DGA052412935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84208d6d61886086a337be1be1bfe10b3e00faa078382dba2c35df0348483d84. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX872436864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58ddcd621550c43e7527b23e173081a472826fa3b2f11fcad1bc8e2b44ec829. 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/QMANG2232875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd9e2950fcba435c60927a604ac0767fa7cced5aa0a6aa928172e7f881043056. 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/QMANG2232876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d57dcdbe693792cfbfcc920722d830059738e6af1abba92c9051b6727c5ed8. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DGA0H2336736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58cf452d0de2241f7757b715cd609a2084c653ce70809d6c8b1191bfaa76f54e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DGA0H2317442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67dc66b29fc1bff2533f9abb3cfa97d5bcd55c8cf91c4e26474a0cc1d247088. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKZGC2306827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0466a7c2fdce05893f0a2eb965e80b102cddba0baa9ad3bfb4698f16390fcf74. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/UKZGC2306828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093947402b2758601c03bd191aa5c75cf3dc8257b45a8596bfcff3a59347be04. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKZGC2306829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bb181cae120a2d612e08ab0a4f7d44d7928b57ab1e1e130cc3c338c920fa74. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKZGC2306830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d6135a523521202751845035d417250a469c210053233ae489e8118fe616cb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKZGC2306831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84208d6d61886086a337be1be1bfe10b3e00faa078382dba2c35df0348483d84. 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/FRX872436864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cbe21de5d1a3473b663b8f1285b119ffa7bf2274ea044a38a6da9f3fbeb26b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DGA052445038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd700f0d92c29ed3a344d70ada944cc6769b765555e31040fb9e6d6fd033af317. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DGA052412935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe945dd49a0d1df6ecc509fc240281a6440245aef82c22bd3a559376f88bec9c7. 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/DGA052412978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2658de9d7a017c5ba04fbc78dab9bf77cc5537f6ebb177361e62be964e5f35. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DGA052445039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe945dd49a0d1df6ecc509fc240281a6440245aef82c22bd3a559376f88bec9c7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA052412978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12a2cced457bc3d066d4ae4b8ecf76b3dd6f7e034b702bd2f81338f45c9e4cd. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/DEQ022391776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4739a7d44a9c7d8e6d9db8fbcfe2c3a5ade02209fd48043db00356e92c660af9. 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/DGA0H2339190.