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 0xd07a6e67529fd0514b9e195f072875669a247f3bd03c98279499eee3ed3256f1. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e4c5056-4839-4b2e-9207-b5ab3ce31f58.json and https://artists.proofprofile.net/proofs/artist/8e4c5056-4839-4b2e-9207-b5ab3ce31f58.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 0xdc18aaed9607fa643144d8b5484757b16ced83f5d9765c3007a44858913fd1e8. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ARL4J2201779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57827ae9a698166d0164a19e39705e402b83de5f7c5dac95cde62112c98fb6f. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/ARL4J2201778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90eda221b62ea7f3c5ca9448db91b030be05daf1f4a90b8f8823895245109164. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/ARL4J2301782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2947e06d442e7731fbe7c8233eee83a733c9649c34e5a8349b0fb6189b7d448. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ARL4J2301807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541749624a37c2f1e83436abb77fc3e589fa1b8aafe10ce490402921ece0ac1c. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ARL4J2301844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a9e8d0372f31794ca585014752303b68b9a28d30fb0d31cd5b7c2b27374d61. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ARL4J2301957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2492c2550479af3726eb7e83258c570aea95f0a6f2f4fbbd9baa42a4655699e. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/ARL4J2402056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541749624a37c2f1e83436abb77fc3e589fa1b8aafe10ce490402921ece0ac1c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ARL4J2301844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2947e06d442e7731fbe7c8233eee83a733c9649c34e5a8349b0fb6189b7d448. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ARL4J2301807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc18aaed9607fa643144d8b5484757b16ced83f5d9765c3007a44858913fd1e8. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ARL4J2201779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350156eac174fdafd309670dacc7de38678763e05f490100e8fe77eacbc968bc. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ARL4J2301843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2492c2550479af3726eb7e83258c570aea95f0a6f2f4fbbd9baa42a4655699e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ARL4J2402056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a9e8d0372f31794ca585014752303b68b9a28d30fb0d31cd5b7c2b27374d61. 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/ARL4J2301957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d62aee6d05249922780dcd7590f23b72720253e55f0237a0f609b29b365d2d9. 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/ARL4J2402073.