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 0x4af466c0809b4426e8464a469bd15cd941a078de0384a9a3f2d8906b49f8f3ce. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/89076ee4-2544-4bb8-837d-e6affaedf745.json and https://artists.proofprofile.net/proofs/artist/89076ee4-2544-4bb8-837d-e6affaedf745.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 0xa8bbfecc8f9995bc0f339a618788b1ce39eaff1e94610c9bb945dcb115f335a4. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBRKQ2297000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffc8ec59e0b41397ec3b9f30b978786c540dd396dbd7d63831d2b6af6610d11. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USLZJ2292462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c92d87fc8d28e081456fc9b44e16da2f89b468defef07f43559dfa39ebdca8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZES52255305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf820be5d4da5239e3159c57bcfeabed7ac467f1bb1286fee550230e7b5cb742. 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/GBWUL2162001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9078277202b0abc639bb27504d8b622a4e12cce5bb8f2f60f76af8a0b35cf070. 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/QZS7J2180233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8114ae630434e65a0d42fcbd4d57ac63daec230d22bceabe954a0ed36a852160. 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/QZWV32320838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c8ce7049cda8021f07b959e8a7ecd1507ddba6c29cfe7fec04e2a55542d3a2. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/QZWV32320839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313deb6e8742f8a3b782a9a21c0eb88ef88a3ff3a0de83bd40cf904a35754b71. 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/QZTRX2104171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4ed998217b49693ef547e931c7df77dee7a9038d713932a111eec098c6cd78. 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/QZWV32320842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb618230a27730f87cda25de3e35fb917570da9f6f5146d9f7482edef4fe27c2e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZWV32320843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b8d0785eca5588480489b47a88f7badccb0e41fd0084812fa537ba601e5619. 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/GBWUL2390880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf419e02d5e6b35f76f7fcb634f9b28e822144153241e016ef4913a1f3a1be10f. 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/QZTRX2106056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33aac6de85880aec390227dbf4c49e2524bf237e3a366ac21a968d34474dbed9. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZS7J2132797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7be790d94867c112e6e2c1817201b0c291dd2ac0bb7f98be804794e8e4deaac. 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/QZWV32320847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a768a336b0e144feb22e3b8eefe6a0c566c2ef3c5867836296f850ab91fd27. 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/QZWV32320849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8bd370dd4465b9c27efca22bfee680a6fc5479e33d4d70d314d6184ba64ecbf. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/SE6XX2196561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67ab965ede57a7a8b1fb48a59fe322c06ad3a4cfe98f735004cb5332c7bc42a. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZWV32320851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c312c445818140345cfa9756faf2faf4351d112b9edb8488a6e30874426f8e. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCAFH2024103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f90860f728be1f3ba3c4cbb5146be2cc37de17a21309f5a64f17eb2b62dc824. 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/TCAFH2024107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369dc1ae2f8fdf468bc20132ad1a3bc871a69348786eabcdbb67538008054945. 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/TCAFT2143246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9078277202b0abc639bb27504d8b622a4e12cce5bb8f2f60f76af8a0b35cf070. 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/QZS7J2180233.