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 0xb8a203eba06fd3ed4e3fcee305aa0942a3d91108d55acfab5192e77c53b5d4c1. 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/7f565785-c4d1-4913-8e6c-555fd13eb84e.json and https://artists.proofprofile.net/proofs/artist/7f565785-c4d1-4913-8e6c-555fd13eb84e.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 0xcfc0b4239cf8d5d609a1d483f04169276564bab52f90f72b025fd006f9d7b97c. 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/DKAQ90300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c73ce6df0f85aac04e7742009219a288c2a3882e5883327242df7a65dedf205. 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/DKAQ90300103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b799c82ec6bdd072a4b87d08f542a90c96bb2b45f1ff993335c133181b44dcf. 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/DKAQ90500401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c7e075422cdd99ab7cdcf6f8f29fb1d461e5f746f52f875626d66fc4db3014. 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/DKAQ90500402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd3b3597ba5995b0ef73429a4790a1b143595eb2d4b606f1f70d2b60844159f. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/DKAQ90500403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4722aacfa9a8bd033f01e936cd0ceb2ecaf71a873b060804caffcfb9f14e874. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/DKAQ90500405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee1becd37142c341c2f8d9078da57830aef1d91547fbda1cabafea04e93e789. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/DKAQ90500406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2735d9f2cfcbecb3bb61f9074b09624649ff00ca3aae8bd364c8791160c8146. 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/DKAQ90500407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bccca937fcf42ea371cab99cbcd8b53846c19f8eead562293761af7f87d584. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/DKAQ90500409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2684b9c5970fbf61f300f41a1358223674927851e978ad6dc48b48acd56997. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DKAQ90500413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f5a0aeb55a31c43f3f9c63eed5a9a62ca1b28d160ebce3d43516d7ec062c66. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DKAQ90500414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712ee0a1fffb41014503c1459f80f3420f01dc33e9c1dc3da76911a9caccc554. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/DKAQ90700303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95265e77e5463b693da0dfb0ab098403a6dbe4b752c56a060f2b4160396b6c76. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/DKAQ90700304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0106995c6a5372b32e11213aeb77b2ed5e247dc0976fa77c20c9e757b309b943. 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/DKAQ90700305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945138e6c8c333d43800c6c751ed6b4fdc632b68c8fd2ca547a3febd521143dd. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DKAQ90700306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc39cac1578e01873d698bf8cb45bd67bfe28bc58c28361959ae7a04250f6b5fe. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DKAQ91000701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ea252fbf005cb425905df1e2da36a5779a7790769afb159345f13cff243f74. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/DKAQ91000702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c63d430ca3239db3d29107ca11d21ded500cebb40e8f86ee82aaf39e973f807. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/DKBR22403902.