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 0xc17372ce9c74426e35e39f9456857356f812d583bc5a54ece0e6aaa98e38223a. 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/4d707087-7cea-4b36-aacd-488dd884edb5.json and https://artists.proofprofile.net/proofs/artist/4d707087-7cea-4b36-aacd-488dd884edb5.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 0x67c80a7b45d732b4403c93df3f684d694b985af0496539035a23205e3ed58e20. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZGLS2385515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d9e0b3e522a4be163e13e18cdc3bc40a2f8d6e14f33a7200393e19a69dd75a. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6F2309630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x007d17eba399f3d0c6deef0a5f31e5b6df24426096f7728a4169f25854f6b25d. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZW9K2304589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0e59a14480a3aff32e4bde2961b249e5abf6780188ac0c971ec6fd25f3dcb9. 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/QZ5AB2482570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76295bd91cdd468a2a96d0c3ef5138f9850866251595e0ea83933639913ffe9. 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/QZK6N2414585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255397c9f4f348ee8d7efa35b6c4006ce42051eb50da4b69365c4fed38a42b98. 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/QZTB42420622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0aac5c4632cd2668927edc3153501c18750f22cba1b8e33ea22c77928f66467. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/QZTB62450090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbded75b1a08f7a747ddee23f664a1e262df08337d8f9612fa101f6a1bb618dd0. 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/QZTBD2492797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e9fb894e91767eed88b790b4e300bde8c1049a3ddc763a24124816a700b998. 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/QZWFV2455557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c6991ceab85f3d24a12d83f1f599ab4f6ef2e400ff4b1f47183ea44121e693. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZW9M2429333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a802da28d6cf08f0506041a9fec649aa618bebcb81392725767a14decb3a2b9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ42510676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cc4e90f4689413709bbb47c98ae6c33a5730737c1e30ffbd3dc4c44809bff2. 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/QZHN62592325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4613f15658e3c5102cf96f835258d7eb49915372ac57f4a2f6081b94019333c6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZMZ92551028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d54e09f612d4e4fc0bbdbaac38e48a4771636a15ec2a14b4dbd00ffc090df4. 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/QZNWR2550582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bd5a66c79aab646c3f4eba478fd50f1c6d7c172d630b21ccb5fd94f9d89e05. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZNWX2513239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7b8b1091cc8acc4bca1c407705ed12d958ee58412d8e9f560baf58d930a96d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFX2560477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61917a8e8f73912f9383d214dd8ff69bc83625afe32f5790b39b84dcd182e720. 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/QZZ7S2534515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888fd437dda73bf3e6eecaa42de9aedf55b772ac61b6d4e0ea2ba985d78e0f8e. 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/QT3FB2513658.