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 0xdabc8cd6880ba4a965cea76af1c55bd23944dbfb8cf910b08e8c60ca65f6a617. 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/71b0ccfa-1581-4057-93af-52ec5f4fbc83.json and https://artists.proofprofile.net/proofs/artist/71b0ccfa-1581-4057-93af-52ec5f4fbc83.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 0xd2df695d5dab466a7ecedab90c38ba9eb40c425c9b60b81d7d9c302ccf6e0acf. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZA232300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4312ab9129ec24da2d16683ad12605d4ac5565231f975f2b32f421c0e427c245. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CZA232300119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048e06e4063e7711c8c65ddaed6ff3ebeb34c9edcdf037444e949055e9cc3b3d. 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/CZA232300121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aa2c8971a336f844684448f8acfd6dc5aa4f39109f5058f745cbc08e8decaec. 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/CZA232300122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d680a8145dcdea53367c9f174123d4d094146a74d12cd378e08ab75ae509b1. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/CZA232300123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e33a4b927ef874ff9154e2dd474da553126d3e5fc905bbd31915adbb719de2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CZA232201263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd307b6d1ea4cd3cade36c80d9eed0d54713a579b476198bb1694dfdf97fd64e5. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CZA232300124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1edfdfb2b4ca6175345bd40c3c1c2bedd5cd3507de58d086e498c34af158b650. 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/CZA232300125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745aa4f2a482d6ae48d76e56924290bb62630ae98b759c96251ffd96e1db3a16. 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/CZA232300126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e6bb7ef3db64de64b775bbc8737e94206c791401f833024f4d31740fefb521. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/CZA232300127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51991bfb2a7256e1b51506040fc0b53662c7423917e7c2fd998b380e4860b16. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZA232300128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296b73796d38ee8cdd695af3246684e13ad1733607da6ef27b506d7c3ea3f92b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/CZA232400314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b0ab5af7f3c7cebecc84f2ed6769937f60f2b6b3f6e64ceb2779362473dd0e. 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/CZA232201206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a50ef730a27b0b3bca61ad0e81f1854ede468743738588e50fb0b53841ea64. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CZA232201015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e9fd12f019f6803e55197aa9fc389ab38d79449ad7240a2fce5a9e71976570. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/CZA232200835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea816760de2434c3df547ce9c0476235fde486c4057c5ca62e7c1414a3ea244. 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/QZPLS2160155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce48031ba7a19e82998aa62882a3c28498fe20f541549d84005fe6674ba8559b. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/CZUM72300239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0523483e96579196325db6b92da8cf5fecef670c9d3739812bb728d1ee24bb8c. 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/CZUM72300240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5188911886ac556dae081def582b02d6897785ab92a0249b1f5f51eb5cba0ff2. 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/CZUM72300241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafaab5fdfa139d773bd623d8f2dcac3e23ce9057822c84baad26a4615bec201. 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/CZUM72200920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ed2a59fa85dba3bf420fc9bf1340f430b29dd9221d56efa112c941328debc7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/CZUM72300243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bd604c8fb68c27b9be33a32846d7f153cff36bfb6e577b1d44e801d152e288. 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/CZUM72200415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911a3606ecab78f720944c0ad58faf8652a233e635074019737bfcb94bb7ff51. 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/CZUM72300246.