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 0xce8223b23dc11a74ce5d1e58b7da454b771999eae47e1abbf20ec52a18bf11c0. 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/ffa7c4a7-ecdc-431a-85b3-1497cdcd36f7.json and https://artists.proofprofile.net/proofs/artist/ffa7c4a7-ecdc-431a-85b3-1497cdcd36f7.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 0x9a1b685cfa6461aa77a65a9fd7f732a22f8e10da05ae8a862cedb9606b5ecae5. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QMBZ92069739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc160c568f9956501843d581d254cfbfe6dda52a7957e2d01466dda7c6240b0fe. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNWX2052235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd574626319febeead710a84bd02ebbe4280f68f026391a09216b429d0b9f8b7e. 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/QZNWX2048121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8812db80be318820456530257861263289da4730b91bd5d1ab892844ced01bc. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZFYY2167337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9338538f4d712899cd1f6a6b3278e48742b4e3247f3d52746b83133891169805. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6Q2140286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d56c654517dea23a0a61eb4277ffd2f17cda2f0944104f124bb6bfb990f0d0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6H2128616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67f1d27bf87a9996f3854637831ec03d2820bf4cf909af8fe6887a432dd710f. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US3DF2239468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb530b23ae539eb2122e334682b8ec61b9194ebfffe00c725fec9519aad2813. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/NOPTR2309010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef26f97f141bc7910f712896467a39fb91d9681f72fe7df02731affed8b0757a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NOPTR2309020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8fb5628fcf5a400a47020b1f7bd0d21b1f07277d03f26ff6ca5bab35801072. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NOPTR2309030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf522050815314c6e2d3cbcf454fbb323c9f3e9d34e9bb7465dd26138d4ba9d45. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/NOPTR2309040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e811f36d36d8c66a309bee27686f8e5032b2bbbb55f6af17ce9b5fcdf85be6. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/NOPTR2311010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97fadbbcbcdee3e4948bbb09edb6319964765701fb81357d7d98c9a90edfee10. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NOPTR2425020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350fef99ed60f361c1adb994c7b02843f8f09cffe41b47cfc833bf4c0c312713. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NOPTR2425040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f15f5015ab3ae9d38d65a2d8c2212b672d412b614d2e36155a8430e35e3728. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/NOPTR2427010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8055a658c5199742442d54c1500376e332a7a5ba6809ecd976d6ac8278c655ce. 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/FR9Z62100597.