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 0xf547b23add5fab4d53764b1d9e13e14d8930b4afb4a484f449c829673c9f1eff. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34b1cc99-56dc-4f2a-a6d1-86894991fe64.json and https://artists.proofprofile.net/proofs/artist/34b1cc99-56dc-4f2a-a6d1-86894991fe64.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 0x6d2af38f90e5f946efe358959a46136b2a832d168b614d97783655869e9f56fd. 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/USQY51545669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9571bee0bc84e28fc357c3a521e9194f676f6ed5bf86cbd787e6eb277008c693. 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/USQY51545670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f2dd29c950bb4f34d56263fbf9758e734511e0f6e6dc006c341684e99fa37a. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:02:17Z), 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/USQY51545671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aa4395e99221f75478f51d43e837ad2e00f6eb3b8aa60c5be3da747020356f. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:55:18Z), 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/USQY51545672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8cba17664c77f3f5254ac4a8d53fdd36eb444e5ee4939dd89e4c2b2dca6f729. 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/USQY51545673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8d42b3a04ec6f9fae45b4e83771aa272310b57abe821168017e902f5c1a0d2d. 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/USQY51545674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48e98215454acb86dbadb2b017344d58401fc6b4cd5bbe12d0c857ea6b1b873. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:24:00Z), 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/USQY51545675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x600e77cf7980bafebde785edf86d14495dad86222d427aaef24bb598b877560f. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:12:45Z), 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/USQY51545676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef23b712effd2b8ed4e2debbd25ef1698f78154ff04822e1701440f155f95a29. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:02:19Z), 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/USQY51545677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac389ce66e21b339353dd5e501da00b356c000f235dd8e99e3ae77c678040add. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USQY51545678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863236d30f86926ae0a3a1263ae800f23d017845569e714acdf9622cede6d0c3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:02:07Z), 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/USQY51545679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbae5a90fd6644db7d7513b053b351719d83519c9d597d10f15802c04ab79c02f. 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/USQY51545680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158e28e9c64a9c096cb7449e64bae17febffd87042ece1398e8f70ca8aadc26d. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:23:39Z), 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/USQY51545681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e5eb52d3404e2ad978269caaee65ee0fb236d00d6f56354d48b1a83dc1e3af. 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/USQY51545682.