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 0x75a82a7e54a02bf7061abae5348e7743ae25281cb503410480a12d1bd6e287e8. 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/72d8acb1-46c8-4e1f-be0c-a57e9dc99690.json and https://artists.proofprofile.net/proofs/artist/72d8acb1-46c8-4e1f-be0c-a57e9dc99690.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 0x5338ffe6631106a54bdf1ecad981a90d8d61c69d0e112e338b9bba3e6c011d6b. 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/QZTB22439067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175b37938eced2c20c5af70b741a7a5b3c9c4bca5ad7a6dc2ec85b45be5fe7e3. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZTB22439066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc952bb6ee5e7c4d9cfe5dfbd8b42b12166fc588a2748517cb60b81ff14859eac. 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/QZTB22476497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5399b68b9ee0b38929088bdaca6c9cb2597992b4be54b4915f237faa8c4be5a. 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/QZTB22476499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06eb24333e8c3a6f9b5b2a1512fcaac459237de0577f1b87e8d16cc4ebcc7dff. 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/QZTB22476504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a225b52feab3627e2cc7080dc6841c65ac569bbd43038f851d6cc24ad674234. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZTB22476500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c14d69387369f4f61510fb081e4e2e03b267c191d35cfde794b6078c4cdad1. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTB22476470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8dea5b8fc947ff9b9e594fc07ef221038fbd94aa1fe9ba9e41616998af23da5. 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/QZTB22476467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a2020a0cb57844015a7e265c24b4c640cbd523e6f480502bbafe36f29c46865. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZTB22476502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a5f51d68ed048dddcfa3732b20e4db5ed11d6e772610061ba6012c4e830b1d. 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/QZTB22476477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5376b7e9aeb013a2e2b16d22ae07e9e20a9238812588a595c38fe5e14d1af11. 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/QZTB22475132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea320bf9fe744bc2b270bd71f39b8f8833019d2dae2b97b144d067fce23807ac. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTB22476503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90bd079463ee6c49f3a4917de1a9ea812ccb966a33a3ff09367fa0ac3f4d1e3. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZTB22476495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff822ff0c1decf08c3a3dfe5e84d78365adc874126d7723ec5469f2a247c8b7f. 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/QZTB22476490.