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 0xa45c638fb47a10b7c4b49af2d3fe17adb87031e89882ba5870bccad89ffc0357. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c632e33b-bb7f-4eb4-a4ea-cf37a544e818.json and https://artists.proofprofile.net/proofs/artist/c632e33b-bb7f-4eb4-a4ea-cf37a544e818.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 0x82940c214fef40eb429a21cbb3c2046ed10ee47e5879e1df3606d867a556edee. 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/UKAAZ2000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1459e0fe7e5797c0cf4115ec362085fdab4aad9704a6bd48858cce002056800e. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/GBNYT2000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a2b1eccbb689705e37e24c33f777e453342ef56bd1294d075b50d8f7771c22. 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/GBNYT2000038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80002d4e28840eb56e6b60f5633164d20f068fa2fd63d682ee01ad10e0ad1e1. 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/UST2Y2000169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1d30b9ab494f521f235b8843415a68ebe057dc373041cc1f5c795f2e200183. 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/UKY5D2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5cea8b6f551c706e097812ddd33bb65b64896104e6bfa3488413b362984a911. 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/GB3ZD2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb8c34368cbbc88ac79e66049a4f22a3b13adb9e546159c264e5819ac19c031. 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/USDY42060761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b40bc2be5c6164ee7c2666f0ec21edce6454823aa7a6fe56173142f2ce25bf. 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/TCAER2011252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b657239eaccca07b9e20766d4ceb2e06886c6929865984856a8b097b51f245. 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/TCAEN1934832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4933170967a9cf4681de8c1e4b522d8a719f3ca2b235210b6359e5aaaa4392ee. 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/GBNYT2000039.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec3663f6b6d72f1212bc395adce8f9a684488ed4dd5847c442830f51858b0de. 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/NLB1U2000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fcd622814e686324499122a6e737d27ea5997f1c3e7cea5f5c113ef4ed8c38. 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/GBNYT2000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0989a3a8a188e9cb39386effa69e1b5669f8f8ca0f83561ee81f1d2c51bfb5e. 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/TCAGF2278951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3767fca8f1a8e55f6eb03708c3eae6891e2ba14c8ce6641c86b27a566c739ad. 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/GBNYT2200020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90272c8a384d22033f0b757411ba7b7604933fa564e3c873a5b2638765fcd8f7. 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/USCGH2107730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615b5b1c7c424b8bdc38651a070309df1cc7b1daa7f86dfb768c381ef17d0470. 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/USCGH2406339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32708f4264e4b9a8024b28b9ce2806d18b8fe733302f33dad035395cc2aa201b. 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/USHM22274677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef727c29d3e2379569cfb477ea174543db26256a86ff0299353e24f037aef5a1. 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/USCGH2279650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a896688a0fafefd7d503168ff35a0c578d0755e73e915b44e68abae6df9e3e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USL4Q2013526.