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 0x302b7d9e67262f1ea32116e9516077acf22011a08e160cb24231e05012712d7c. 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/b63893c0-619a-45e2-ae61-ce818a814529.json and https://artists.proofprofile.net/proofs/artist/b63893c0-619a-45e2-ae61-ce818a814529.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 0x61f9c3e7e0b8e8b7f66029e9dc89a0e45d8e2b030f1dc8a96fe8d18a6f39262b. 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/DE1HA2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5812904f76150de2f279df0a1ab620e9ce53ee4c17fbf24007da80ac6119601. 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/SE6XX2353089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801ebc732ad88e3c71380e577f1eb8c5c3277436b4d5aef1845fd4bc5c4b90df. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLUW22302207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859ac8cc96c5f1992a0a3ce1d2e4fd19760cb35af5d0abf5997feb170a8217ce. 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/NLUW22302208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1404ffb5f8179ed1612a68edce30eed4b8ce06aaf76b53c545628f75ab155a4d. 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/DE1HA2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb2297f824d664e9c0039546172b2f81654c81bcc5afcd88d2e8d81424c8b1d. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DE1HA2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0783280ef3e6a4efd01ed28f602eadaed8c092ce53cb4530f61460e034dbdd6. 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/USANG2277495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00b9dd1577ba0256ca55507f0e664a67bb7ce14e2c3bac9d0770486531f7a79. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DE1HA2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934d8d6cc998dbad395f5f340be4c1254b529f4d91e09d7d27d0a26b33144a45. 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/GX8LD2206786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f3b2c33684b672f40134b651830902346d6dfa649388d61a6cf4eeeae9b8d7. 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/NLT2H2200679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40b00cfd4e9d28332f9a54a4ec8a8f60c9b2699c1c81dfbac2e7e815044aaf4. 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/DE1HA2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94cbb4919cb0211a044e7d5105a16f7ff0d0a85cd3ac681b86080fba368a11d3. 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/DE1HA2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9627a5804456854a16522c8fb50a57104a591fa9024653b905b152761b298543. 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/SE6XX2202447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c9ea52fa31127e45891f54a563b9ef734f92fd513c4ec0749419014d7ee6a5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM6MZ2585353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801ebc732ad88e3c71380e577f1eb8c5c3277436b4d5aef1845fd4bc5c4b90df. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/NLUW22302207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68aaf39a955f8e3209b8701c80f65e60b11823745b637501c0df5137adc4371. 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/NLUW22302203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8980d1376530b6d13c5c1c0269fa925dc4d08af736f026337df76e4e43eaaf75. 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/NLUW22302199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9432a6dfcef31750d4e9d5e69adeb8919ec513b229e13fc938c59e1e048e081a. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/NLUW22302195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43503c35c9e429551ecd82445400dd909a2fb8a5c5d69f38d63e704f2ae64ea2. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLUW22302191.