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 0xdd0e48f10acadb4c1e4b2a51bf849d69a96ff6256f121a11ed8c5447abd60abc. 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/d1847ac9-4134-457a-ae1a-8a2ab18adf27.json and https://artists.proofprofile.net/proofs/artist/d1847ac9-4134-457a-ae1a-8a2ab18adf27.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 0xd63deca9f9581471923370fbaf14f0ff42c6416378b0a73b49bc8cd8d8900098. 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/PHV031910738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46664a6324230a1496a262d2cb84c5cb76232a3d99d27614ecb6837a864d230. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PHV031910737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1efef9938ea975b8451fd16c12d2680ce1c923456442fbe1296bab0222a473. 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/PHV031910736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5a8d251473d0531f85d2053be2851b9fa02956c9fdc977494349b194d8b9c2. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PHV031910735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce15019c54dd74f9a68d566b8bfaca99a4a8a8729f17a43a89c750068bd4b805. 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/PHV031910734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b996e1da9c01d7cdf4dd1a3e459e0ef2d40d4e1626dcabd938540df0ef3d9f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PHV031910733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206d1cff07b5ff9ec3cf9bf993eaf2a1a06eca36710f35f57273f7d4ed56d27b. 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/PHV031910732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660843bd89c34f392c477e111c8ab85c87a005b40edfaa7a47be76f4e464e37a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PHV031910731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6f02f827ed5562176dc82cf6f2fec25034ca7c9d00a3c0f2261fecbcd8a306. 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/PHV031910730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9ebc27f6a4039c66543b897edfa02c229dd03cae2a13d4cac453e492c82058. 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/PHV031910729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5857f3828f2a3be7021a603e2d46189bc7a7cddda3f4745888e80925235c7e54. 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/USL4Q2431216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8bbb9a8d91eaef410011987f6b5b9929244c3ecf5494ad80dd70d804b0acc2. 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/USL4Q2431218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253e6fbd129692b29ba47e77a35d26377703db1eef2ec69fdc9a051c66166bb7. 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/USL4Q2431219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb81eb51b23d23ebac8f5c5fc7e19c1d9f435358dd6c0ceb6c6b2471fb2860ea. 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/USDY42442293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e6f341722c7bcb5d31941892ec4d20945bdd722760220edb6b81e06423921d. 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/PHV032111625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefa5a68a290c83eb13f099a64372b81c27e84a5613029b53d0a66add8c95dc3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PHV032111463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3668ae9170888625be5f7a60848227f29b691e69c4af97d777a9abeb119f29. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PHV032010945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1566e83e19d28ec16ad81e758d722ddb2f7cf0abebfe56732119f801d26a825. 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/USDY41986027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2433fbc0dda8b987a97bdea08c6f47a91ba3885a3e8e55d0cee084247f2b7b7. 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/USHM21858490.