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 0x74d4b87e06d116b13d5e03e165ee7c4034d9706c1274f1eae294328e1d679d8c. 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/c9ecf6ea-83c6-45cd-93b8-b7ff9595a5bb.json and https://artists.proofprofile.net/proofs/artist/c9ecf6ea-83c6-45cd-93b8-b7ff9595a5bb.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 0x92bd46de681a74b81240f530a28ac3386be81468a2cfcc774f1438701f96c6df. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZZ432355478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857d89a2d1c17d0cb1a39680ec971a67dadf791a82d25a7fe38265f17fd1c242. 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/NPA0D2438466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e1b4cf6097f6c286c18edff400b494d0427586f1618eaac2e23be299d1072a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/INVA82201100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b85f2411a1b2e012b086c7f919e6917cdec3a687e89b0c0015d24af84da006. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NPA0D2436823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2093acec8d77475ed1d84d40d33c8230117c0949371d22f59622357e43de47. 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/ING212497461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e2b433ddddae67b52c0626b372d10e1211a9f6306064dd03df57b77a236023. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/INVA82201065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24be965190ed89cd99c689ac9b66e17069c9fa8a8273235821e23fb577dfa29. 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/NPA0D2436731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fe737bbff423740d399dfcca6a07efa7a9d5542988cad58f7f3431f9af1720. 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/NPA0D2436663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2a470fd56d188acdb3ff5d0e09b88aab749c2af5c069e68afbbd3a1a263471. 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/ING212480753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7075206331e98974d60faaf710eddaa16bf0c5c5dcbae30b329bc7a833e1a6. 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/ING212462821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249bb4576f2c342fe3ad7c033377c6a5523e7df6725e7a770d237b15bee564fd. 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/ING212344930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46727b3c44b7481ccabbc655c14a2077500d458484a10f66dcfe7e404b34296. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/INV862201165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76de4af822a4e0740f5ba6483efc5214d4214f2440d83fa1707fd52c5be3d1d2. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/INS7A2571709.