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 0x48c649134e2c69a54c4b3ceb861a5bbd15a307181cd2083e2f2b49e43464c55b. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/396bd1bb-b92a-49e1-b09f-f6adb3681227.json and https://artists.proofprofile.net/proofs/artist/396bd1bb-b92a-49e1-b09f-f6adb3681227.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 0xfe06a09b4ee2997570e2af14a4fb1a032ac7f3ab65cb76907a608f70a1f8073c. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/TWE772388011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8f4cb3216e3354b8aa4e04e48e4fec46d2f7cfb5f621b35ab6f022cd86761a. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/TWE772388012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efca143641f2ece2cb45f0b1aa2b0ac9c4880d58379bd1569a71f712c5dd5d0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWE772388013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575a191a6770318c362288d1717dfc580ec93ee32e4c5cc24404ad6081a20d0b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TWE772388014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63aab581597332ca9ca4e45ae2abdab84d1bd9a3b8e776beba2fe06b72b6d7af. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TWE772388015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaccd6a5fc1e448689deb6d8c3fcb26b401d6811f6060530c63d5520bf4696b07. 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/TWE772388016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8482b764733c8364d501eebe00ed53c5ca782ccbae8abbd9cc49ca9e8613af. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/TWE772388017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abaa14ea44c6207f2578a90ec04ee9c9255e3e9a8dd80911e1617dbc8a3acb4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWE772388018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a89fce69638226e5bc9c888ff852f03da6bc66f0b1a3ea4eebc7d470292a8e. 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/TWE772388019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf655804ae19507f5d29d7c2933934a86481761c5786442dfa3130f9b32c54bc8. 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/TWE772388020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ae412959bae394a16489939ca49cfb720e90c0b0056da0b6f4506d515ffb7e. 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/TWI432500501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb50a0dcd357469c85449c44dbebc6b17adcdbc996e8f06ae6a496d8261b48de. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/TWI432500502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75be8a9f16d1aa9669dbb5302a51c652f41632eaf54e7811062ae6fa08b48004. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TWCT52216170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf057deea08078f51b55e3872c2c698966ab6664185eb0475c93f662453aa8fb. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/TWE772488013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ad4ea98c9691940ee86330186c6dd8e55ebe97a7733747b4b8e7d788cae485. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TWE772488018.