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 0x7b7139d6247eb11b67dd054832dcf49da5f9c0c42a6de9ce0ce04cd30e79ad30. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33af0796-2253-4307-baec-70f7b885d223.json and https://artists.proofprofile.net/proofs/artist/33af0796-2253-4307-baec-70f7b885d223.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 0x5e3017563f75e7623d6c0de5ba08d590de5ac514192832ff059d705c14418c9a. 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/BXIV82468036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffa6be1a14f97ddc2b3ada388d3e8ba0e0f51d876763291ee9b92c04bffb45f. 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/BXIV82389743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d61b4b41b4f413df6b54ac74d0c37901de6b202ecb21e8def32ba86945b8f0. 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/BXIV82388136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8327ef244c2bbfefaeec0b135ccc9b068e2f9df656cc1dacd106281a24517fc5. 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/BXIV82387390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae55b37a2b814e13ef9c80e60cccc3e9fc6254cf20eb2879ad7dc5204b112764. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BXIV82366268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fdaf42fb91be4325581bf5c1b6da060796b131eceba4afd885b3ca0ba501fe8. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/BXIV82363749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220ed593eb59bc0aaa592aacc1c31e1c75e462e8f646109abf81665b2db549cf. 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/BXIV82304088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd6ad6ac28ed9c163ee62a20acb6b39e35be92803acef62e7ff03c5ef2b2a77. 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/BXIV82319303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bec2b8cec71ce241d4c9acdb3e0835e7e00fa999d2eb3acef0a239880793f6. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BXIV82395747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e5185f014b5332f74c14fd8d79d5adc5c7a901aac790e962c56073bcb7726c. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BXIV82395507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cd4b40bb328bb728ea468483c83bfd09e9e5b67abbf070eade36a86fa51243. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BXIV82399576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5180abb20205297fcbd7afc18137d2cf819a23a3521067d7428e387d18abb651. 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/BXIV82374023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a28f4d73b06d2a61f23ef95d1600b614b380b7a724c6967efbc4b364e5db9d. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/BXIV82428571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8ca255df186d580632c23c6cb568304f8b608733c3d3d78811971752200b00. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BC6M22410875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1f4542b80c3baabae161200f5500d4b3395139ac0beea7adead92288d1681d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GXD7V2598260.