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 0x6551a2325f11c2ca225b1fa6adf98f7dcd364a5fd32da11f5af5a8fabce65cbc. 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/e7a9e9db-8682-4c3c-b16e-edacaab89396.json and https://artists.proofprofile.net/proofs/artist/e7a9e9db-8682-4c3c-b16e-edacaab89396.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 0x0bec44de6c17097e77f2c4a62f63b5a1ce5402f4285a13843e088c5616bf63ff. 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/QZNWV2092581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7887339ff84490ed8eee9184143d08250805c1b57fb5697dfda1b06214c3c606. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZNWV2092584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96334985e47aee394270d16255f2909ad8256c98bf444248135f733e3e82ec60. 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/QZNWV2092585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4228bf137f9695d0e4ff7ddb2869446d4533a12c18cc0f4121e762f0081b9b0b. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWV2092587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bbe8443768247b5799d14419db1c3b75bccbaa307989c94f474c52a655e277. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZNWW2070109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5addef3c59b635b002bd6c48b2a95a02d21c3352dedceb34684ec2128ce29bf2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWZ2077106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187006cd426bceb49678eac99a926e40862013c926eb029bb864e097b9d477db. 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/TCAFO2133881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d44c6896764e00c13253f76e281d388dcde3a9aebdbb8ff53b7d863796328bb. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/TCAFO2133890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b5ceaf1d34f07e967c5823a89dde9186928e6955bb10270edb85d381815870. 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/TCAFO2133892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e59c54503e8345aeaabfa60ee6c551c980635c53248477dd6b4d8a11997d1d. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/TCAFO2133894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c5182492f7dd0009db34661b0677b94d6f3721da76c6bb063ef627594a9838. 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/TCAFP2119505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a93ce5d9f9be8a9cb99e9fc1b4e3925ad94fcb72d6a10f28a91ed4c530f3ce5. 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/QZK6Q2119349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f24efd49760a5c3220d019810a86d71d1b1afaa9060cef48f3180f674cc7cda. 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/QZK6Q2119351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b6dbe3d9155f01d57dc8042e384aa54eb54a8f4edc7230247cf4961d696c6b. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TCAFT2100951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac061e680d2b97858b5ce118436690cc442a9c07a5a110d28c37b40ad283d79. 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/TCAFY2119947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba6778ad250a05a6b56aeca088b0bb2ed85e852425da344279552d6a3664097. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/TCAFY2119968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd132dc7854094d5a5b0144cd86e95682d11f6ab89670da17d45ec5a2e4e1989. 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/QZK6L2201692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe353eb87760af9d149657c2668656a65dc7e13327a1b075c681f03fbdc57fc7c. 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/QZFZ72487715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525f95fe31fabe4aea94b2030854d57fedd67fba3efcff1ea3f51216fa5caa59. 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/QZFZ72487721.