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 0x573cdebd4d0990ac5c63dd6f291547347bd6b7f1b2f23e70e14235354ca1028e. 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/80242aa9-cc60-4a63-96fa-920805ee378f.json and https://artists.proofprofile.net/proofs/artist/80242aa9-cc60-4a63-96fa-920805ee378f.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 0xdbc6899ce0fbd471b6656b6bfc1a0f5d7767d6dbb51176043a9e5cb7baa7a0c9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/CA5KR2503194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f752879d4a9f7c9e0fdea7e7cf68d7fe4e8b99e6fcb8d8e09770836c86f319a. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DEAR42577489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab312bd80d54aebf72d06d4b02e0f7e7a2f456f37309b310267552392efe0bc. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:02:33Z), 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/FR2X42595218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba36efd5483419317ddd0ca7de970db952be4a7621e5f0a8cc1f4a2511adefd. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DEAR42551242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7406c11495c44e39c396699fb6b067f3896ab6056495397c853c3569edda056e. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FRR642500782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e71b792226a12d1fcd44ade2f1fd463fc87057c20e8499583256715d28e67f. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/FRR642500840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52ff8412c004039c613bb3593197b7111278510f1b706efa6e819dd07ce40fe. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/FRR642500842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9a5676c749494be2854d25cdd2882a8cf4b219e6f7052bec1c08dc32c148cb. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FRX872520381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7136678f83a0f8e5fe2021249e7b62ae70b1078a5812f4a6cb8b6fcf1ce07f8. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/DGA052511156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00693e6b08a843db5306d8dabb53c43289ff318109fbf06ab73897d2efb76c77. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DGA052511153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a330c94bed3049c5aaf0cb2d7c1f8f1cd3519ac7b951e5b988209b3544dc28. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DGA052511154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902c551944200d048f0e52d8e9bc1b2d5580e05def16dbb519cc651088c6d1a8. 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/DGA052511155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3068a96a5b114ec7e7dafa842687da9b13bb41025a4972f99da29436ac96b17a. 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/NLCK42505641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f16a585d701e8d1dc14a8e54dcd9ae160f2cb5e60b3cda118947fd20ed9ad79. 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/NLCK42505647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954fda388d618a9d3833953d5835e5e9c931e4bf9cda1b00c2da3891b179bfbd. 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/NLCK42505648.