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 0x1f2ac5a05390c95770e4e922869d6347df32f5f6adc81b177a153653534f6254. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3caf60f-41ca-4ff4-822a-59caa0e795d7.json and https://artists.proofprofile.net/proofs/artist/c3caf60f-41ca-4ff4-822a-59caa0e795d7.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 0xddc8ee51ef00ab1594b91df2abb8a745965b7c75bda51a560adc3a11bffc513d. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES82262746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff59d8bb6d010a59e5d82e012773c38ca032ae5708a01c1c3c763bfe93c9b8b. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZES82262747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca76adb81dfb5443174f608a838b2d4aec94188d960d78ed55e30f58e18c68db. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZES82262748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7766da4a3c991bdde29d5135e1dd613b2a140354724bfec0ec48c2e5907ef51f. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZES82262749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7121a9e76c17df16eeecc96d7c80148d402e93c3190b44065c6c9345928f8bf6. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZES82262750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001096293b331b58957f77ce94002d77dd6aee018498df162f7e14d0c3fa9134. 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/QZES82262751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bd3055bc2033d14f78afd7471126a557215401411ad37c1cda4ddfdd18631b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES82262752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1292434803a4e552233b111468fefd5c88c677afc981f5ae2d96c0c0f33147. 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/QZES52337970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8706101414cbb67b084d695cf0d23883e67d2a9b4cbf4bce6c512122d4c210a0. 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/QZES52337971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8519b24cd69a83ffc305da5eb6312bd24aad4d5a3bb9d5e5604ec761159f42. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCAJQ2573606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8519b24cd69a83ffc305da5eb6312bd24aad4d5a3bb9d5e5604ec761159f42. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAJQ2573606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27bb91c2ddebfd8d1f6b61d3ec858601625cc050f9ef036f64a0a192bdd8df98. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJS2523659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7741223b062d0fe65336b09e5c7167ec3e73c4e37a37e4b1b2002685fed593fd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAJS2523672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e127a24a76e02445cffb0c8221c8807b82653e7c7084ce7610f58a35c406772. 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/TCAJS2523676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6931bc7965fc5fc02bd2416c22f0a5a091b0655980ea6249c1b7089e1f9f3b. 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/TCAJS2533109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd8cfc16951a5ba63f5b712340444c705d10a56a0132cd61303486bb0434e4f0. 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/TCAJS2523719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3156f51e01fd3f257501b17c4c8e9cac51631aa47f764fe3c6f43df2537ba7af. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/TCAJS2523688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d939f3632190ba1109e7acbe8c8b9e7a922bd547f21ee883eded56d5af8a75e. 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/CH6542379052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd9ec88376ef9187a89c4ed0f3eb4b4d926a61a69c97d9242bf662db0cf529c. 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/CH6542379055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd55c1a051b9093350009b27084710898a40a5976b2f72d2e66533581be5366. 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/CH6542379057.