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 0xae8dd521372d1a94d420c1339cda1936b0996c2980923ff953a3637778aca519. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6cbc76cc-5d4b-4977-b6fd-8f0aa08475a3.json and https://artists.proofprofile.net/proofs/artist/6cbc76cc-5d4b-4977-b6fd-8f0aa08475a3.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 0x30ca68b8b4517a7f9c34aa451715c03466fc9566dc203511103d73e0c34e4ed3. 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/UKXN22098113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2fa54510a83dcf3c02ae9172d0f7252010d41c4a2b154609b7f4f1dd2feab2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWS2436775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68db5489a76f7819c0524e60a1a6b562d40f719a74371828a84823b18ad1119f. 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/IETNW2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57fc8d816c5c498b54e8b87d3b4486fd9476c90ec591cbad929f389491c2e8e. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/IETNW2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcbb79ab20840799e0eac5100ae96528df7a692b111047a0a255b4bda237cfa. 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/IETNW2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ec703a6ec799769adda537cf0781b33408151d70a3240117d6cbb033d0303d. 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/IETNW2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c622589df758e533f0141100847202b9451a9e361fd0563599f8c405ceae0c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/IETNW2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68db5489a76f7819c0524e60a1a6b562d40f719a74371828a84823b18ad1119f. 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/IETNW2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec20aa5aa30cb887c619462625061f00619344e178ba5e9313617514119bc9e2. 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/IETNW2200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcbb79ab20840799e0eac5100ae96528df7a692b111047a0a255b4bda237cfa. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/IETNW2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1c0f6920de19b8404c3785e2b75c0b24a25358514a6bfa7da6e7ee45e04ea3. 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/IETNW2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5114c0d7118007655ec49e6ccc18e3e56b5f624f0954f5375accb3eb447beead. 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/IETNW2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d804feebf743198a9526e27bbda08dc91e233d1cdb6e217ae9c71186a60e73f. 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/IETNW2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2f2f9e0e9f4936bc967bfceda673dbfe790a185ecbca969bb6abecf42bf479. 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/QZPLS2032098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c6c0500ba6a3cfcf1ec49a92921170aa668958f9f409a4a7b2e3a379f10e6f. 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/GBLFP2044704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519380ddc62ba1ed3b7a5b0e9e2d5f7f3efb27fa7e9a8ecea8f61a4bf341b974. 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/GBKPL1942505.