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 0xece6d09d87d7c73a63af8c8373a59608daae7487e6a5dcd330005d4de3201aa5. 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/9acab932-59ad-4afd-9535-42a2b898272d.json and https://artists.proofprofile.net/proofs/artist/9acab932-59ad-4afd-9535-42a2b898272d.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 0xcd67574355acae46d0cd303f038f71bf97b874474a6314c44f1132d787f04a62. 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/TCAFQ2173489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea744fc3cbd98d175f8c3da50100c631392264ea9948c525d99d15ac0d66cdd4. 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/TCAFQ2173518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a885b2829b1697b20e43e91ded07e2e5e4f61c7af7eed9a0947a0473dc0103. 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/TCAFQ2173520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac56c6c24c6a24b6a0366d8ee20390c8fb327ac9a4dd53e94bbdfcaa2b67b72d. 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/TCAGD2290853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95333ebd0f2b9e27db907494180e2f960fb815073d637cb9f2176e0a9672b5f6. 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/QZTBA2265965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb529b5f8f3b4d452518f6b9bb8c4ff15f05c2248be0cf28aa65ac8bb4bd613. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBA2201297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2122821f09fcbac3a04c69a6a0600e501ca7bf4621058d53298488b68645e386. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBA2201298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4625b6ac1d48d077142e97b04e8c270d2902784cae60da7a348f3169bffad6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBA2201299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e26a4b4cf886dd89e605497681963b30f2cddd3d8d8b0285516e80e3ff9011c. 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/QZTBA2201301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28242e400a2ce8cc45cef3a16ed7a6adfa226d56608b61daa81d2c51481a9f62. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZES62394424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943edf1ff5e003795fe384723f33c3562494c71ef0bb095802eaffa33014013e. 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/QZK6M2340901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c27c3a384117e5b9c8e1976b9dee474389c88be3cc4b6c5a24f16e58c8f7d5a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNWU2320934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0757b07c6e05c0139e0de84ba4782dc48908fc4e0259402bb2779570276f4d6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWU2320936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae661529c2d79e7ddae22737ff35e74627b9f917d3f94b22a9c741cb75c1fae7. 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/QZNWU2320937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9828c7b8b21297169e91ab7ab791a5933af75b1f8f74a32280e93510d84f2c21. 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/QZES52453765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x483039d009a726a85952ca03285d93e71cf4ab21dcf7b562ae94e3a42e4be65d. 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/QZK6P2401873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1224502a60168b345510ad812ebea864589f2ffcbca5f053a94129b4d33715. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTAZ2472074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35c6c08bacb5df4d2a48e730b883f1782ffbe917097d5f6255cffca01e69bfe. 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/QZTAZ2472075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7317b576cdedba06ae09ee04c280322ec3a11d9031899cfc6b9349ad947b68. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZTAZ2472076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xababdc4537fda566f769e6812d16db48907aaf6bef84722a0745ad0793563a12. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZTB82476329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e4ebb6896196f56eb0155c9dbe1c88cb63edb9c5523cb61c8aafbaaea2c144. 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/DEPI82325207.