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 0xb258eb6c13275291c9899a4cd1956944308fdf9c7b62827ca88c81e0364c6502. 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/3f7404bc-0682-428b-84cb-a02f30b8b999.json and https://artists.proofprofile.net/proofs/artist/3f7404bc-0682-428b-84cb-a02f30b8b999.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 0x53fbf3796c11c8bd0bf5c5cd2d0e23a8e7f58c0b13601606064e917947d91984. 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/QZANL1710846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8961889b73035755106d741158b3048f3e81636ba86ea96845f068d46a80de2. 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/QZANL1710848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6df9757c5049f8a882866be187b2ac74cfb39aad212d5f96d47ebfe27cd72797. 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/QZANL1710850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb2c00e0c3129d2fb5aa8a22014a3040f7936014898858d0e574bb416c324f6. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZANL1710851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56eac57ff15a1f2fcf1480ff8b9531959d91dc3b8281c77489c2492057fd551. 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/QZAPG1754839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107a72b22ee655a8d4feaaab7de90a89cc92201534a5adc49b42b9013474ebfb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZAPG1859198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac594fead1a65a177d0ab6cc959f0a9b1ecde2388fd258c9819079dd5180e4c. 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/QZDA51912810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee27c457cbc34e78fb01423c60d98ce6eda019f3df8ea0ca2dcc8b09ae0b6bc5. 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/QZDA51913477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8f00951c5361ddec4480a063296fd94a34961cc9fc6f00941f699b4b3acc64. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZHN51954677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4263a4117b9003158fee6f58b8236f4df1f8be738cd8b2e40c7b6f6b4bc1f010. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZES81994501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042e0963901adb1d5384e6fc9455a6c42ec7dd950e78e8b5a75f15f4ed61c96a. 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/QZES81994503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59c38ec7b6d0a1380bca154c2154d189b392a6100a470b65122e1f46bb016e6. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZES81994504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33018fd30f1eff3583a179ca4e68c9a9ec08dd1068955407ed6674b8ab803137. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZES81994506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc364ba83c2af9d4c2648b6685c38a7ecd1f4852ddf2a1d3c8290a1293a74fb2f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZES81994507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7642c2932f22ccf7692f7c60819eaecbca6dc7df8eb9c78456a59b2c37b796ef. 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/QZK6M2090780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917669c14ed88efcca6fc8d24c2a9bf9af6664314cfde17d338796fe56c36431. 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/QZK6Q2170743.