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 0xd800426c32be0b9cf28b81b3fffc5c1c719975c257155510c7c85295e69df8a8. 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/1a76848f-fbd9-41cd-bdbf-510da44c8b25.json and https://artists.proofprofile.net/proofs/artist/1a76848f-fbd9-41cd-bdbf-510da44c8b25.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 0xd160cf2c1dcf39c6c3b9b92477751d76412c02d17b127ba7926c57556ab592b0. 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/DGA0P2301894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb6d281cc5f02f73d1726d76e6b2e0c8f72f6f5ffa163c6220cb7d0f9d20151. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DGA0P2301895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225f559c0b3715d0b4381138f56b825d6aca80f052140b6c1871acc00f1a8e58. 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/DGA0P2301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x637016d8bdc4101baf644d3488fb84e59198fd31704fec91a99c83da26312250. 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/DGA0P2301897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df051c66b47d86027403c1b8320365e81cfa80fcb544b9b5fd1a7c442fe655c. 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/DGA0P2301898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7625147a55f5fd398237165a9f5c308cf6b48930d5c007403a844e396579e77. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DGA0P2301899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e9c333b4b30dbcb6d1c8d6d92eb40c13eb117f74e6ef976ac61b5e4cd7d9a1. 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/DGA0P2301900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adf7712739a64ee98c1d39e553f89f461817e8a5bcb572b71acfcb39e3dc1ca. 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/DGA0P2301901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa4ea9af3230b102dec6e0f25846d05bb41d7df5ed861ff29c765cc9ea06559. 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/DGA0P2301902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312f9b52c5e4f2bc3cee76ab51d7a6aa12d11a9259f19edde7dce3cf4ca63eb6. 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/DGA0P2301903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab2397117f62078baab2aecff7b04c4ecc9ad211c9fbe7c231734ec1094c126. 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/DGA0P2301904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7866a555f157eeb1d1a8ad112e5b293a421e49d3cdfc1225e7ab2dbe1ca7b7. 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/DGA0P2301905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67b2b8d8af3588bff40a81fff62e33d590a601b3abb0dbf79c8f61b858fffbd9. 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/DGA0P2301906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f28da9138feafe0fc2a792e1fe5cd7af174826e93772700c185bfeee4274bed. 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/DGA0P2301907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b402d085838bb35850a0c3a5e52892a65a57ad0b11be29f2e5d388b5c3e0748. 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/DGA0P2301908.