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 0xd26703d6e10ddb50402acc9c195f9548930ba5f9d39a0bd7efd5691c5f631d98. 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/abdd4afb-d577-4910-ba04-6be252a13ecf.json and https://artists.proofprofile.net/proofs/artist/abdd4afb-d577-4910-ba04-6be252a13ecf.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 0x25813f72ad0a1219ac766958be3bc5ae2bc15235d1aa1295ee83c89b427986b2. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCACW1622810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8d7643681bcc983a8fdc276d6c757760a369fbf96119d47867bcdbba69b069. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TCACW1730082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c9a1578cd6cb52ad7c773061c5349ca73204529c22dbdfec0607ef54f11923. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/TCACW1730089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f65a560b87329dc7c108d65b6fa6908d0d000e4d841bcb8c9dfc1ea5c55291. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/TCACW1730099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083acb6cb4c8f380ef48b86638dcc5d47d52edc071578f8ccc8ae0f2f73b51f2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCACW1730113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fcc43b373c5c14825ab6246c6b303f4f2349722e7643daf1485751659f551b. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/TCACW1730133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b72843fa296bea76033a14e38b8a286f07f12eef4dd3296fd2e8cb024006087. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/TCACW1730136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee47cf1bace750642b547b2daa7258ec79e1df4d50c5d6600212428d6f55e67b. 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/TCACW1730149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727159d881bc5a2513ff959b621dbafdf70d637795dbba23d5bad3b52cf7ed75. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAES2068533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c0201b2f9411f159d9191ac89199e36ee18b43ef6fe258fc040aeab03fe010. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/TCAFB2030829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f01d48475217c1d451f08098ecb0a5e138db30841802b55797a5f04d64bb3e. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/TCAFM2147393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450ad15439cda3bea20757644a7041e425bfc6b818c1101edbcf93b3ee693b06. 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/TCAFR2161679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6662af019c55a4f5d985f19e73ba00bee59550576eeb4df92d777bc35efeb279. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/TCAGF2220003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae8f040e945430748c720d38e33d888877c1ac8941c50e2c96235dee8c2b740. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAGW2348469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9ca1c690642f90f9df655996204fd3907664e71f5ae2742e95173ea8777d1bf. 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/TCAIQ2484409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307e64b75f09171bc3998f24a9311e7ef25794cd2b00d1dde09aad532df2e23f. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/TCAIQ2484455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7757d0892949b216451f404543417dec7c5c54c8df00bb92aceb24487ef78f1e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAIQ2484472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd951e0afa2db6964346c79b5527a26855b16af001d1a54b3d18815bd9c05c22. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAIQ2484481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x844490a1fdd0f5733e76445226d3757250a982d614d0c39babedefd21d691730. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCAIR2484486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0b00d14eea0352fedd931d018ddbbc57b3913032e907b964f9213b7758e409. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAIQ2484494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5717a1afb3faf2caf80fb6a5b40faef38a45231eef65d2ed569d35104deef169. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QT65W2563529.