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 0x6750db81f6ca0aeeb11d983270fa6ec5fd8bf024bee59ae879b164caed4934f3. 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/16bd46e9-6b2f-4b53-88d4-2cbaa7f57c77.json and https://artists.proofprofile.net/proofs/artist/16bd46e9-6b2f-4b53-88d4-2cbaa7f57c77.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 0xe9bf76c60a44969e34d503f17500380756ab5f1135106581f272351e0a057bf4. 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/QZMHM2013004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5deea09d0d2912385b7f549ec571258c9cea62ee495a1226b6f96f5bf448da73. 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/QZMHN2085649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d3f7b2b525a00d71c16343d3150ca75ae9fcc4d51dfac7ebbcb78af900e62d. 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/QZMHN2076921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b14639485fb192ae16e3261194505ae5e5ab0928a4c0344420ba9b101b26c4f. 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/QZMHK2076714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a644bb225a39ff2d11688f7b1c59c97c2b5cc08836cbb5b462a95ea35c2a9f. 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/QZMHL2078817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34562c970fcbdbc4ca5f2b26e2b84a8d0575d0400a51b0ef867e6ace530e0d41. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMHN2061244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2719ea7048a98533d606d27ecf017203272c9514c5133aaa3de4e96f2ddb363a. 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/QZMHK2050192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6cd5839551b98a85e80fcbe342f750be0ed98d12d80874fef8c1d0fc0f8360. 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/QZ5FN1893107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6482ceb513e018eaec3bc6891e05dff85e1a6fd26d2d554b810803c589d305cb. 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/QZ5FN1893108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c07c2ff011cd407d77d821cb50c600c5b35a47a89fca0ef6bb859878ca34f2. 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/QZ5FN1893109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0733594fb5fa4dcf62d39f8472d383a87e781c40f5617c24985613b3e0eff2d6. 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/QZ5FN1893110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b310d15d70ef018d60abfc7b565228392ff3010de79ad457275e495db6d4425. 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/QZ5FN1893111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805ca71d6d9aaaaeeb0285bcca79a5432c7b79c2dd09f06e2824382daef3d158. 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/QZ5FN1893119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b034d701ab2be447ae5bf49ee7c527ec7f66d3b51c475e72282f84a6b64734. 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/JPX341900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857fc364d7175a04d3aa9755f1f9d6a02c218fd330355a4665c79e54d657f32e. 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/QZFP51981913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400c3dde53d117e6849fb464ed1d04b1530930f1e6f83b77762422edadc1369f. 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/QZF8N1939541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0129aba88c4cbe6e55c87db582be99e178d695cf429553bbf8f67994363f4dec. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USLZJ1850748.