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 0xdd1c16438add2695314a0f0c42d9ebc9e8c54d54f5fe00d882e1adc9902a56a3. 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/c16cd949-1692-4c2a-b2bd-379d05c10c86.json and https://artists.proofprofile.net/proofs/artist/c16cd949-1692-4c2a-b2bd-379d05c10c86.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 0x4fe07e8e01c5878ed8527822802ac0349368a8b80b68794408582be518a8b1fb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMHK2304619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f92195349444f4a757f3c2afeb9cec37d1cedbabcdc4a3a82141a41bd7d4be5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZMHN2337274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2d0f619ce65af35aa6774086618c0e882c5924b7d31274760f9480f7e51622. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMHK2308484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3324519afc0cdb5cc4aa3e724d6dd5df1020e89689681adfbc0d2eeec4ad2206. 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/USA2P2022120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45436afde5c49cebc8e0dd066d2d807d81cbd5562df8726eb3580342fdb37a95. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/CA5KR1977911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c600d160a34a07477cd1981456bc1f31e018dbbf7dcf8bf812b2c956f1de765. 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/GBSMU6853175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550464324153fe89088b695d05242992631ededc4e44453e6f230940e5937688. 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/CA5KR1911983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822e6ba7adca1da3c2d6089b153504af08def5d6a57a7b1411d5972f96b40566. 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/CA5KR1843369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f610d4abc23528017e0df906f7c8de7e45a4b41f96d810f92babd2a759f6a0d. 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/CA5KR1835954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278450c045605afc67325a02fc73a9b3b15196fecc6b75112d1e48cc1d21d1af. 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/GBSMU5181097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fa723743a1325efae78558dd2e47f1d84db6d72d0074612d2dba9cbde7eca4. 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/CA5KR1802591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2edf68b47a15c5a5db7365250f07c2daf6bd27d26bb14b4956f15bc4da029ef. 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/GBLFP1787766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9358f8d50bdd140506721a093d5a1d87a95f3439da4a72c94ec52cba3364e5d. 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/UKG8V1600180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe3d9ef368ee4cb026b71661ef1965f8720342e15e7d5e5be04453f7c48884b. 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/UKG8V1600182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5f3eefe7f63d44dbf279fe7cf8bda9e4d01b8365874e30e41646089c763239. 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/GBLFP1713742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7b3216d85a2eb31020e8e5e833b435cc7fc69cdc79d80a776f07d6fffcab30. 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/GBLFP1709902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7c901c9ca6280df0b05296cd40b8b89125ffe15685ba21e0731584934506ae. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USLZJ1710582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a366fe06240029f9e02b9e0a6caa8078d31f73f6884983b89df6cba55650df4. 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/TCACT1661481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524691ad0b5b381345173a20c19b4f30ec0cb413d06563afe67e643030d89243. 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/GBLFP1642224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd9694952d5abeaae49a7babb9be1ce876fc2eae0c087e1e2033175e40f44d3. 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/TCACR1697653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb43f2c6b3b90c7af8b3797d7d66b842499e72c23c52d8caf038627a1a1d7e6. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCACL1619278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc372b6442e9b31e6109d14b8d4fd622b4ec84654ae4ed0d8e66456681d5f97. 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/TCACJ1585279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfac173859c5f9e62f62c16c4a080d257bcdf4c212c86e2ecb40a08e5a24ce43. 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/TCACJ1514753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1622b827b4d0a61b02be0f0ac714a716271170c83e8185f03fbfc8803ca889d7. 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/USLZJ1531788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b97dc0e948dbfc63926910d0a9d56583cfc6578098c4019399591586fd79bd. 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/USLZJ1527301.