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 0xe666490b6d537d834e1d5ed6c54471c923d5f417bffb1141b7c2df0f75f9f744. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cbea491-c2b1-4305-b0c8-78c2944048d0.json and https://artists.proofprofile.net/proofs/artist/8cbea491-c2b1-4305-b0c8-78c2944048d0.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 0x07ecf46e2dd55e879347c832bb51d8c22756570ab86430b3bb23a846a5247880. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/FRX762000953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa438b68478f710fc55db26314138b2bcbe4122512ad87503e2b2b34a63a7d8be. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRX762000954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b6d2f991ca385c3460f42fd6eb3d798d37911ea1d6bbad57f1a69376d89851. 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/FR59R2081835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c44c14ea7e868593a9161cab06fcea4a1eaea086f842b34644fa36c325205e6. 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/QZHN61971737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002eef76edb316f0e0759df7a46ccbc0e6816a14af21390cbf988e24fd160d35. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRX762000955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cabeb6f594287625ecbf1e84aa0dc4f429bfa8caf788c07d14600d14339f4a1. 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/QZK6Q1924667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842b75512c5e8267401a1a5528040b01cbcff6a942cfdb7ddc45b94fee49e524. 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/FRX762000956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bf112de9060ea1b486d5e56fa6a5b34aa6694014a8f597c6276cad7e58b6ce. 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/QZFZ42008825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc224c601dc18281fd3133f39c8307e87e6e65cebc9b4ba280e0da31d0369b7. 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/QZHNC1971177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b38791a99613fc768bd28cbdfb3bb6189b1092b3e25850f2631d53c1720abd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRX762000957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4898dba884d0b524ff2e213527423e439332639a651eb07cfd8e781304b9c293. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRX762000958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629f980e91ee834ffaf2b722e3c3fe83bd0cddc6ef96ce067844e30e97202ea6. 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/FRX202025804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629f980e91ee834ffaf2b722e3c3fe83bd0cddc6ef96ce067844e30e97202ea6. 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/FRX202025804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b6d2f991ca385c3460f42fd6eb3d798d37911ea1d6bbad57f1a69376d89851. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FR59R2081835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cabeb6f594287625ecbf1e84aa0dc4f429bfa8caf788c07d14600d14339f4a1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6Q1924667.