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 0xbc21deff141ff9d17734a60f7c7ab0ef83789f6d5944b07dfa6833808f834f72. 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/29af7788-886c-40ba-a439-052418f24fc1.json and https://artists.proofprofile.net/proofs/artist/29af7788-886c-40ba-a439-052418f24fc1.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 0x52d3ba6c34e8d84872d7f0d3397184b32f2bb4d6ab0b550ad86be8f273d832cb. 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/QMFME2343316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6967fe6882a3385cba2dd6ff3d7380a0700772c6100a3dafcf1a3ad35754615. 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/QZTAW2257121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520b8a9a8f464149b4537eb233347eef175145758bc1f56567986f1e08525c9a. 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/QZTAW2257122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe6aa30a6bd8aca3d39e39b509acbf9ca54f175fd4ca4d0157ca7a546a1bd77. 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/QZTAW2257123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26fc5bef629e6ffa693f8fd035ade8174619745a3e26f4df5747d532b7db0d2. 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/QZTAW2257124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2edba7d039580cf8fc4873f1d8c613df91e0d3d9e0126714337797181fd0c6. 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/QZTAW2257125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccca9e3214c9c753a27677be3813984aa2a0504478a41f179ca8ab3946821c7b. 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/QZTAW2257126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b4201a7555a626284de750edff49cafce3a6ee0210ce5d9b3d33074bfaca60. 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/QZTAW2257127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e76722ca84ef4734f0bc72e7f33c3cbf6a4047f3363f95783d823ad16e8282. 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/QZTAW2257128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2ec52ee5e8995e08217ae195ad65769d0e3744faca0d471934ef762f1cf2785. 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/QMFME2390036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a31217a66dda6f56032e2a5875b740ff386c8c08f66381c2600d11b35a7721. 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/QMFME2390037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f9b167956435f7cf10983e05530c7da643dc340aa53f8176eb0e13e04cc986a. 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/QMFME2390039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52d3ba6c34e8d84872d7f0d3397184b32f2bb4d6ab0b550ad86be8f273d832cb. 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/QMFME2343316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac47ca5a340c6f3dd86ecf3beaaed51554ff65a0d2c686d3b0ae7805295e3a6. 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/QMFME2390045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7f426a39ec0c9604e570339ca6ba5ab3558d9c01175bd5bb3b200f40fed436. 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/QMFME2390047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c45bc902e3301b524bb9438714a6ca6d6d472b13fe2b0b9a01331b7ae2b92e5. 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/QZHNA2310522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17015abb89db8f62d1251a5f2eabf0c3ccb4e918f328c0f1603a8812ee2dd0eb. 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/QZDA82382305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c379973a1aa9790edc5281758572db7d6451dd293c14ba798c400b88b64386. 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/FRX202338121.