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 0x43c6f198f9d13a2827216845ab185e29cb25a548db4eb1c75eb206fd121c9cf0. 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/e4119c69-23b9-47b0-8f96-eb3b23ec7174.json and https://artists.proofprofile.net/proofs/artist/e4119c69-23b9-47b0-8f96-eb3b23ec7174.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 0xac9472200c052b8f86f22b669f38372d1a473c3d0520ec8bc65ae65bcb9a94a8. 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/FR33T0106201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81055de6c95507d4e3fb06e7b42c0263f9466b988cc2584deadf4da028806d95. 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/FR33T0106202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2e700200386484c6d63e52c8e90c66db586618d81f7fbb606827056e830648. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FR33T0106203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb8290a5ca0b305bdee943158e2e169cbc8a220be9d13de797cadc265225438. 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/FR33T0106204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x047aea39cc9ab33e066a3a387681ceeb40ef5f40e736820c79663c8e60b8ef30. 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/FR33T0106205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe114983335345260719ac966688fb2bcaba817b14d32dc8070d7ea579ec3d5a. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/FR33T0106206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca5b204b65668a4ba51bcb2904062f15029585fa6793b8a1473a34fdbdad26d. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:48:02Z), 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/FR33T0407801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdbaab428bac4739c5ebf20e34335ccda526d746d160110a32131e5cefc986c. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/FR33T0407804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264b503c9cae165a28e679acfb65511e82c19f8a04187289b88a51d0206c6ab5. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/FR33T0407805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d69a9b7e3af7a039abe4daf35e172e2ffa18cc7530c9bbe9ce4c1827a518126. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR33T0407806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078dff71fef714351890cb049fe7efe96916c93273903e63f02abededf086f9b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:28:47Z), 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/FR33T0407808.