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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 0xc1e6d675605eb1da4303ee1b8683925e56559f83da9c068c615468aae89ae222. 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/dd5038e9-2b8d-419f-b054-2ac4f522cd24.json and https://artists.proofprofile.net/proofs/artist/dd5038e9-2b8d-419f-b054-2ac4f522cd24.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 0xebb282af0b7099ef451aebb6ace906f3c29aa4391a5368480972e8c7ed5849b0. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZDA62111015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472971d2dba23607f18260a0becf792b985e8ff90e7c3c8de4c5dc46003c3159. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZDA62111017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7645916adb810fb4a7fb45b5187b3e6ba8f5a5969c8373d357b600f8f4eb73. 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/QZDA62111019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe87ad10da6329ba57709f1bae9c723c72c27d7d16feb385820426e38fec8ad7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA62111024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e94aec79349fb09683d5319cb1dcb70332e20aa12d809f55b90728782555d6a. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZDA41873499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5db5e34ab10c914381285d588adc1e9e15524427ddd1c790651b96ba2d9403a. 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/QZDA61859485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39d6a1b0dd3f7a2a813134ddc0b9b2092cb00e3aea88ab6d5bc06b8e7fa325c. 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/QZHN41953149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa847851d385b8145321663090db99c20aa94fd61bd69f05ca21caed7d9759840. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHN41953150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62295e57ed1e8fc0945275859f315de66e37e4fcf76ad3279fb3b3e6adc9bcac. 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/QZHN52000861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3893341ecab30ca673475d7823e5cca3e55943c9937f94476dac0c1997522219. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZMEP2055852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2638facc4aab12ab34995df52ae8830e1188b9b828cdf392696cbf3c7688963d. 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/QZFYZ2239228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ff4b8d11214ae68963376c51d8ac9a8ac1871cac3b6ac901d6f5ade2177624. 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/QZFYZ2239230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f6a1b9831352c8c8a59d873af2d202d9241919b28d5d7d0d88acddad4a0cad. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZK6L2339962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe41a0fc90f57e04b3e0752f958e06e38efb037d41fae1b84757546e0e80aea0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZK6L2339965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49df5729bf2891c65a3567f03f98fc834acaae141e8f8ec93d213340f4fbbbf8. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZK6L2339969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586eadf674dd6695fcb539d4becddaf51024625456594c7ed3ec887938979f11. 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/QZWFG2373425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cd0821ce79134d07281d5e3cf261ae055ee5479e5794087e170dedcc5ed178. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZHN72435549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6111c98e911dba8fecf16df870dee12f653c4f42b5dfe90155a46939ff4d5420. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZZ792575017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa0a09686ac262cabcc1ef3ebec2273b1170c3ee52ff701b09443b11c63a4a9. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZZ792575019.