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 0xc9d5b1c5aa5c82f1840c5840db6c9d6d2c5679b04be2183d316403ba81270cfd. 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/03e8a853-754d-4cad-aad7-a036283bcb57.json and https://artists.proofprofile.net/proofs/artist/03e8a853-754d-4cad-aad7-a036283bcb57.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 0x4c8fbdac7eb345d0cf888850ae7e2e81ac751a3092f276889d57022b0a99e17b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ42030387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadb853361d93e73dac0a7d7685b27eb7cc71c5a2d9041bc9eb39e41e714484ce. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZFZ42030397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6e0ca6429514631115eb80478fb8e663e9ba8173067eb6ffb4112f7c8d101e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ42051688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b51b7a667e9e6d4ebaa2f2dcef86e7cc742d3321d715be61a44755b9149049. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ42051690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9035cec8ccf5404b7d7083cac8378eb24c770a9bd20ba9ce7163dc895dbe1d. 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/QZFZ42051692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fe8aeb9e9494b286d0cc58708cd07c0d5d4db3b796cb1c52d937cf52d5c055. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZFZ42051696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6152cfd4bda5446513b691ebc4da08ffbc722d6b802564cc9bc49c997aefd31f. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZFZ42051697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea3efb691ffb630cfb771eb86e28e5ae812361939fc7439999ba052e427e2c6. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZFZ42051698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8ca84efed0b9e213aa553bf5efe3e304b456faf910eba75fd4fb202efa41ae. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZFZ42051700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe255fca1b4852b943d5ec0b9bf2c4c02244efaf71c5735ae7bc5c43705f0ac84. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZFZ42051702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e3ef2c5e158966cde097951d469ffa1f5d6e936839ad8c93e3c165324294c5. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZFZ42051703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367ffb4d1b547beeed4d076d9c4ca8c6948ff2c418ac1bb771aaeafeb7247fe1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ42051704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647d0c5a74a32be8f943c4c2d5cece4d671a7f37fdcce991981be1826ab49526. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ42051706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25e0504ae7e530f94b1770408982ee5d40610e9bace210166c5259c1101d1eb. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZFZ42051707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb47582b5c417dcec24f55214306c7e00a6989359e0680265d2bef7af58750d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFZ42051708.
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