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 0x8865e07424db93ca3a5cdc38186657df24f15090fbb00114cd3ecc4a234dcd9c. 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/bfbb3a41-d152-4f02-a6e2-b3106e9a6506.json and https://artists.proofprofile.net/proofs/artist/bfbb3a41-d152-4f02-a6e2-b3106e9a6506.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 0xdfcffc50387f1eb42969e583b65c5cce444a39506391d708a763103dd79fd50e. 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/CA5KR2182142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a4c1f087217bda440d8445666cf0982cb6c18dc40aec75e11b5c855967ed69. 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/CA5KR2182146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06fc6e3256c7a3d612953896c0aaac3ad51ef9b808027ad0147cb6dd1fa9cb4. 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/CA5KR2182147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9b02b4a24e16de68f233d05f5b75581adb14840c39e80348588dfa13cf29fb. 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/CA5KR2182153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850e367ecdc0085bfd787d169879281f796530092673c9338fb0f65620eb59aa. 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/QZWFR2306912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef97284270633c26f62cb9c89042595c4fcf8b9b715d3eed489c769f6e6e99c. 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/QZWFR2306914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53f3559f7809abd52da5c2ff62fad78f5191a0186fbdc7a197b8e4b7f1b9120. 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/QZFZ32426386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f1b42e9fbe24f8e550890810421b7f79f02bd0df548c480bd93f671e3288a0d. 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/QZPLS2305976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cd8f57a7b620948082cc9f5659f1358f91b37c32c7ce4888928dc64be45c3e. 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/QZMEN2376253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b87e55d34704617ef778ba3bc406dc0c7146c267d4251630da51ce86207ffd. 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/CA5KR2336113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b1e8a5b2863a54c240f7a9d03abb48e94cece7e216920b21d343f013e27e5f. 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/CA5KR2321228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9bc01c68e1bd64af71df053970dd8530e483623590452fc40f401be75729dc. 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/CA5KR2318051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18959cee858e66dedb1b7a07c62251066576928d544206276218168008d0380. 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/CA5KR2177954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbea9b3297518ae224a8384d06bd4f92fa8cadb216d5870e2cd725d18c7f779. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CA5KR2077400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714c30b247724dd1e363567d073049e93bacb75084b4ebd630570ff84c921f3f. 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/CA5KR2040007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04d05099a55c8b2f7becbc342860319e69a7abf2652809ab297dddd532bf06a3. 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/CA5KR1930873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf336b3ee0523aade2ee419870ebe13f319ee9c5ed144b51dfe6595b981b3100f. 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/QZDA61883540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1ca5d41bb61bc44c2333b633271771a47da045d029327f1ee8c644ecd37308. 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/QM2PV1742760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbad367c95569469aadc520699bc2905327c7c12e6cf825e6f829aa180ac873. 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/QZB4J1846285.