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 0x5e2b969c34683bd06052c9d7f1047c631041b161bdf6a77349365c647106ab0f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6bd1c3f5-9e8d-4600-8a27-2dbfac959e06.json and https://artists.proofprofile.net/proofs/artist/6bd1c3f5-9e8d-4600-8a27-2dbfac959e06.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 0x02e6ad1065ac8c00a6ba41b0db5cb246a10e7965fe7697008d0e6e51173edf3f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CA5KR2463735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70f5680e5ced60d1f1cabf714ccd073889d98b43b772c4383cdb2cbed5cde96. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/CA5KR2463736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdb4f04c3f8425a696aa3b929d8631c3d216b0a7e4c0e204e39b7da909b564b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CA5KR2387219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd8ca3fa536ec5bf5d4ec6122a519e92174ce42b0fba06b72a7dc38ca4cf974. 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/ES55E2300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b18dbe78ee990072797e422ab9d77d62332f5ec1ea702129c6a5629de16a2f2. 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/QZS672241279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc998f308518fd4eedbad38d7d3c63d5c5cb02110fcf41e348f1cc44badee3f1d. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZGLM2265625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea089241f7043a3e910de4f6432a71eadb936af784259bdb9714fd183f97d7f. 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/NLCK42401295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7597d5de6736f5feddba34db5039d9d1814af6a6f04c5e6e1052d27e5d4ba4b. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLCK42401297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fc8584d29919cea6d178a5a50f7a46c9092b61c36598c1f2bd866cefdf624e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLCK42401299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b96cef9885fef46bed978aaf2a4a8538d89dbe61f3121dd8f81700abf7b8c5. 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/NLCK42401300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469f926431f63a644308a39585c8a8c1d2fd56a6bbf093f5f66d8ec244b83a5c. 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/NLCK42401303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a6136b09ba8f5d7dace3eea9ca64a90f57af59cd09459e6822661c795cc98a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLCK42401306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569eebf6ad134294407fe7d358bcb559489ee0a93bb2c00dce150cd55b702675. 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/NLCK42401307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0205f2fd791074ee4550159d0270a7dc7022f2ae9e9a3242eb445defa92a7aae. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZRPB2172681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27119949f5b5ca8770a1083c588d2dc4b4c9cb581ee010fef11e31aa2a7b5f2e. 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/QZRPB2172704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc247c97d7e7d396f7aba476725302f2af1bd9d3cc78901db1851ce4491dc3d5. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZMHL2489689.