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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 0xfd8e0990d187e4e0d066c88d332f0c7ca7038ea724207a1c49ff21b53e757c12. 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/9d726e89-7a4d-40c6-820b-f9a8c54a65ad.json and https://artists.proofprofile.net/proofs/artist/9d726e89-7a4d-40c6-820b-f9a8c54a65ad.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 0xbd86db425751cbe8926aa1ab818c19f73e35c3a349acd9f09ab086a34799f6db. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU2400450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f0e54b17ef308cae0a20f307a988e3ba49cfe7e3e8b3fefb92034370d72358. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GBKQU2400451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99de18d3fed2e6973aa823f27766d2fb023b5ffe6f2c7ac9328d408ce0f409e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU2364527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c675ab96e38f9a14d5d0b76e8cb5d7afc940c54971de15bc41004d44ac75445. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/GBKQU2167297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62de479e89928ba3dd8279f863d2912c7b6bce578a15483c6fb068776465a5aa. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/DEPI82021435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03346ec6dac14bbfd1ac8eae0e7aed8df678fdb2d71d1e5d0bf5279023234ed1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/UKR6V2092423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764a51ef6837826ed83bbbf30e0ecaf1c330aa01075371bd72c2b6dbb0b5fd36. 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/UKR6V2092424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7828ae2426a1d6b4f92ca957ffc5ae0485671d8af5e2b2835c561b4edacaef67. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBLV62014731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5922b2cba64c1e2eed14f3516686c6b0bb6e4d27ae2ce449cfdbc9b718a21517. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ITZW51900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9149fda2c7e3870c3f30448b7db3d068e63a465535e0e0736112bf7e80a3e54. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ITZW51900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8b2e040b9019b059af2ceef6489af30884b381e22584e01547be65c7178acf. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/UKR6V1913763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9642aecc31542e7c08f83aa4657e05ac20a81e70a23fb854672e1be6efe4636. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBKQU1929328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f5f0f9c68c3d815776cfb058d4e22fbe0c1bc5f65ee54502f8f2186aeb1cc8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU1929329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d7d156524b4d2fa1c81c6b8e87a626a055712d9eaa48bc3aff7930c13fde2ac. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU1929334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabaafaca45c935fa528991eee42b16368e5e616b3cf87b128f71122656bb837. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/UKACT1910472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516bc1880d3ac63ada59cb451fa2a0713d2d0b124123b87cc45d764d992385bc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKACT1910474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec4b6ce0fa5f4c7275d2f3c35fe32716d773cdce5864dac18aa422b4f9580d8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA5KR1835544.