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 0x6af3330f732a6962e37b73cbdb53c70c5d03646aa97aab7ae7699ecf8490fbd9. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dec67bb8-2538-41d9-83ed-fdae3fd1cf8a.json and https://artists.proofprofile.net/proofs/artist/dec67bb8-2538-41d9-83ed-fdae3fd1cf8a.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 0x5ef683fae5f9cbb5ba39024ef3678c4f3fddefd9bc61c81b111401d1d125a942. 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/QZFYX2001169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d27615a4f85fc6333dc2f82ecaa3126bfec78fc47967ff19d7dc952f4ce2ea7. 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/QZK6J2394133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635d65989f987a875bad75d8d0066da4336dfac8a6e1a546ac9651318fa7bdda. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZPLR2429176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bac29026ac8d871e0e9a919e3a7593f2278d53052ec703986b5a7f1e1e7a6bf. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA62538225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280bd17ccf7f4155dad3f7af232697adbdd1e25c4a0d8daeabcca97b5ef22b4a. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6K2554094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcb0364dc7cadfffbbadf31e60ac37f3cb1d4001681c340d9f7025a1b67e0c5. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZK6H2574623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bac29026ac8d871e0e9a919e3a7593f2278d53052ec703986b5a7f1e1e7a6bf. Chain 2 (Bitcoin): anchored in block 958422 (2026-07-17T13:35:31Z), 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/QZDA62538225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf654682e2aaf6cb3ff1f7f86e6c943c68a7cb63529189cf074c47661e9f75e52. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZK6H2574624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9784beba4de25d3f0432ac9a095a95190af5727789ea2df49cdb8cd86ef7038. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZK6H2574625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7925354c859b79eeb581bbd30363a5ac69834518f5dde02fa84fbe400713f5a2. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QZK6H2574626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3f709f2d9dac4bfa737e36ec7a214f2e755222411c907730030fb1afa8a322. 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/QZK6H2574627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42ecf344ddf118ef8d3e989648bd4e310762818b2f317684e16f20cb026499a. 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/QZK6H2574628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9e286992426695e6f6e9ab53a75a93b43fb64702b01ebc1d98e957b4576c21. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6H2574629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490c65516fb85ee72d53bb199424ab80ee3ea62adaf515666f017f248c49a9b8. 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/QZK6H2574631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0dc9b402fd933a21b1c7316b496cfc8eb265860bb8fc1cb9575b12e70e042e6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZK6H2574634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7c19f17177c280fcd07b3551081336db76c308e0c1acadeb974f74053c482b. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZK6H2574635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4ecb23a6624ce0561e419acb574282301104ce6b600dccc98a4c5b7c21ee52. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZK6H2574636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea9ea812492b8cead582d17550274d72205b280c9096243d2550bf8dcd56323. 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/QZTBB2515879.