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 0x1094528651ecfd039980ba97ca6b232263526b62c3a83b88d5e84ec3158d77c7. 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/7b986992-73fa-4589-aa10-f4b2906e422b.json and https://artists.proofprofile.net/proofs/artist/7b986992-73fa-4589-aa10-f4b2906e422b.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 0xe9be89ae5b395bb2cec91b44d8af4505490e43821b562639518387b488d43f32. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ING582303602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f25eb8788c1dbb181fe522f0b6d0f5b561c9643bd324a9647105b6108f0840e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FR6V82324069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c97ba1501d2977e3b75bea0c541c3e55ff99d675410e5ee3d249b1aa05e1508. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR6V82324070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df8aec73af261142c01a482871db4c458f746bba1e822c020cdcba97d8cd916. 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/FR6V82324071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e760029b502b54c84b9e2a6a43b652062cfa387e02d102b33db89e52d0d8275. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/FR6V82324072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025c7d9b83722629a847a399d44726ab1b97246501d0fc155dbbe026963c7d98. 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/INS180461930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3070b15c0959169c46d8f8f19b79c8056963490d5716f1e11a74b9dcf0b6f208. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/INS189210463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaade74ec877814e3ffc3a6a0575a0cba8ee932d5bc45e5c95e9bf63fba7a2d61. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/INS189210464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25207dcf42619c22ca0ade05590fa5179e3e2989e0d07c540793d4ae82dca9aa. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/INS189210465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff789e51d07a13a263694509ec317eb700b0a1c5af40cae8b6511b78ddbaee6c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/INS189210466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7f05844b426fbfd1ef7caa8bdfb9d3e09fbe6bfc6d487106b2b4469e6f9eb3. 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/INS189210467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e6f2957e507e76b16965312ddee6ed3949002a2cc63a4c2d5af921f44f1a29. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/INS189210468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e160c1850b0c25252e692a87860d9542a1787f797c453c62d8f94e3260b046. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DGA072437322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42dd0a820dd838c7a9c3c633c9bec28ef1986c6391e84d211d6652286c24f612. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR6V82330319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c97ba1501d2977e3b75bea0c541c3e55ff99d675410e5ee3d249b1aa05e1508. 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/FR6V82324070.