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 0xb30be1c979251109c487adf89a8493b1f2480008c138b38e7739d11943982bf3. 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/5738fd65-37bf-46b3-937a-4e50e6b8f377.json and https://artists.proofprofile.net/proofs/artist/5738fd65-37bf-46b3-937a-4e50e6b8f377.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 0xdd78a9875436612eab5ab1f559a2762989fa202fd540aece691cac287f538af2. 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/QM3DF2294999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52dd0c6116a9395383cbab5cd00503fe514c75b267399ea220752d27b8aa65a. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QM3DF2294996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf510df9675fcb98483e3eb1330d61845fd7f16df6d594b679c09ad57810bfb90. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US83Z2463837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59da43379a59bda9c516fea2fabf8adb93322c02f4a01312e0c889f0c0b5af5e. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/USANG2442054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77c2bedd7f5be39464018384f0634f11c4b801076d835d4e9643ecee2fd3e9c. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/US83Z2512342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0b6c361fec7facb916ffb5d783da83108348aa47a49bba1bed056a685ad0bf. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US3DF2268606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c7d2a126c5e0265b51c23defdd7d8fcd0c1019ce65ad2a9865e4d576453249. 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/US3DF2268517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69132c0275ca0466233d55f7dc7fad16338d0b2542253a76996ac5a00cbcc5a5. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/US3DF2268609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cfa87423f2ed311b2c5fde2a8767fffcd4340e5c0685ab967015df5adb05f0. 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/US3DF2268613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe559b029bd0ce96eb844016405113cab2c32a6decc9f51ebd6d065a84fa18488. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/US3DF2268520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782bf7b3ce8220336b5090759be99c6890d2d7f4046e1ab683beac35a048ef28. 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/US3DF2268623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e9c6ebaf025839d7afa3d79edfcb08828193de2be9af149f71c49739018eff. 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/US3DF2268625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1748d0c441267f464ab955498126ec1ea17bd4ff1182718f669a1df498704ec6. 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/QZK6P2433337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3cc99e0b44d3bc314d4ab0f2df68ede1fe78a6e66789f896db1968dbdc36ce. 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/QZHN72336169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd492300483db4b82a507ecaa61ec3025d7ea99e97d6f274256f3ad24acb153. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZHN62397352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe559b029bd0ce96eb844016405113cab2c32a6decc9f51ebd6d065a84fa18488. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/US3DF2268520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c7d2a126c5e0265b51c23defdd7d8fcd0c1019ce65ad2a9865e4d576453249. 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/US3DF2268517.