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 0xfddc10286ee424be8f9ad5fe665df5d900d8ca9c07ab4b61e42dcb17a8242b31. 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/fd43bd9f-e4ed-4ecc-a950-8f6ef749ca01.json and https://artists.proofprofile.net/proofs/artist/fd43bd9f-e4ed-4ecc-a950-8f6ef749ca01.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 0x65cc7a38bb39047021e293c09aeafa45c9067f3f6065f69c2e024cf316849502. 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/QZFZ42085838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697f08d8c7da13ad5d5622b369e48b667de9e59c93d64c40d293678a5b6dd6d7. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZHZ32154835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba544925335574bb85f2c5229e52a03cae38321658a38505a8fa17c3e43fe185. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHZ62192990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc822e20289c9e18a102b41f2e5cd1d57bd035196f9163312eae5493fa672a547. 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/QZTVM2116961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fe8666c8211d4f9712c85162b3286e9beea246a6ea72973b9acf1eb63bbaa1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZQAY2205899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5941dcc293f2fb228303465ae94bbad1534a950e7e2db63bc94e95ec2bcd47. 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/FRX202213200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e9e08eb56ec94110e356b9b5822247469cd246966b43d97635b09a72da7389. 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/USDXS2202682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f79e3bfa9cbde8c3351c3bd2ab150eb68ed87f0052baafb6450664e3cefe04. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/USDXS2203469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15996df724e8ab8e14410705624d18212f8d878aeadc8163ace6d445c663dedb. 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/QZSYP2326348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5941dcc293f2fb228303465ae94bbad1534a950e7e2db63bc94e95ec2bcd47. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FRX202213200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa818438c959cd45f2dcfef0551d643b1c5c04a7dcbda2ea31ddef69efa14b5c2. 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/QM7L62204720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14554f54a8d508d15264386d69a904c07c49416901bbdf159190c4902f7d6adc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/COC012337761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc5182c6496e5ec835a8c83fd83d665192a6a7e1b13155507293d42bccc594f. 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/USHM81994457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c60b32670aba8cb4a08229eb75c9dc551d17cfb6e3729e40ab393033a32d03a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZZ662329863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55297046f045fa1b6946ee0588a50f0dcf7c2164ac512bfe688701cfbc1f351b. 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/USUM72023183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55297046f045fa1b6946ee0588a50f0dcf7c2164ac512bfe688701cfbc1f351b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USUM72023183.