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 0xac6dac68b13391f4c043cf02527e003ee03e61f6cdd3a09ffeef683ccec34ca3. 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/33277070-2b26-4a02-b2d6-39e88c28174b.json and https://artists.proofprofile.net/proofs/artist/33277070-2b26-4a02-b2d6-39e88c28174b.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 0xd4f9418fa68d2bd8c6bdc10f98534bc7ec81bd7a6dd339a2a131b71056c7ec48. 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/FRX872406988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1882a3052da0570043e5e4dfb356319647f373f6890a12aed1839653e25129a5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GX38U2240607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8ea3a164b4c1a85e40f60aff289f80346a57c47a7257a7894825b976ec3546. 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/UKXN22286576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6720c1acb104043018315bdc17366ee94e22de76ee4f2e27722b9baa361a6f. 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/UKXN22286578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f56d3af5db48bc92af9bf9d8db74a00be410103697bbcf31e37e6070e4b0c1. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/UKXN22286579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153e9d96938ab02aa92c0c0d14d40b16426d4c2f1b633f7332e32b3f139b5234. 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/UKXN22286581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f794e89264a276100e5a0f381a7f894592d9fa9d39f4656c91e6265bff3af6c. 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/ZB80H2300073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa4d56ea13b8b3857c20506a8a8bce2f049f261ea5ba66d3ccefb653ee4c9ce. 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/ZB80H2300074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839ee8ef1ce64fc5e6b1252a3d9809e59b506b5b6497c0797c1965bf29a946c3. 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/ZB80H2300075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d83f69dffed7cf947c55bab0d89bbcf314401e59a19ee52ed3022b29d079be9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ZB80H2300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5620b8f9f3d6f084f3f076567e10b2472aecffc5a1e71e895fd399076e500930. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/ZB80H2300077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee52c2cb862e126b68c65bebfff6650556820c69b4fdb74fa9a6314b49dc0b36. 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/ZB80H2300078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73093879f13f6668b02b2a3f9b49764ba8a104af0e84f668e82c1ca72285d44a. 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/DGA062333797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232f996a07764d2899c570359a5cc01e18fa8cb46e01896fbe7c0ff4ee9e7d96. 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/FR2X42435415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64dfa2ee399e6402e93e01382fd7bca4bc81ccb4a8d6059cd382658abcd4d116. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ZAU1N1900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa462a209b273a184d7197f9d259359f5494f4fb45db2691013b115ba49e1c8f5. 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/QZHNB2300704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a897db0817cd37a7c08c1028e7995487b7ee7536e774f38d9c63c0d76a52e9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DGA0R2490288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba54a161bdcae5078de5b75cebd5b31dee584284109ed993f03bbc88ed882367. 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/DGA0R2490292.