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 0x581bc3f46231c3ea3b3ff0b213d4c699b299eb75890765de3e108b1eccbc93e4. 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/48f2909a-2b5d-4356-b4b5-945e68b7eb6f.json and https://artists.proofprofile.net/proofs/artist/48f2909a-2b5d-4356-b4b5-945e68b7eb6f.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 0x9168429eb2ec092045b5f6a1c90406a35d0f3abb7a9d1a1e89d0a5247ec3fc73. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR59R2209263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697a76dc8a3a787b528a89cc694eb493ad33a3d34c416df0b3a2cd0440ab7343. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR59R2209267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d82d46f703ec05454e99d4f730c0edc17b7170be14f1205e7ae2a647ff67fd. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FR59R2209268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa555987933bc5e7fbfaa3008b76690d28f48e4f10cde73f22dd4405855fe81d2. 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/FR59R2209271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff7978b122c00dcdca44a9ec85ebcccb72fb2173fdc494267a0d16b424ba5d4. 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/FR59R2209272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc858c1756dd68519961e98804f07aa1bc339f3368a87f2ea876086ea2b52d5dc. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:27:54Z), 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/FR59R2209273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936014b7675232803587fe04b5c4a3207b72bfe826e5daee9ea3dac416cc609c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAII2462224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5dbadc1a648bd976d45431791fb16a1bef7142f77f2360a926f6034d7dd1c92. 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/TCAII2462230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5215dd326038d08ec99ab5fbb8e755f5530faaef0fa72a2bb71934665cecbf9. 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/QZDA52441249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea516183fb1ccf2e5c586c366e98f16fe0f9e985073da2ac4abd6406648cf2f. 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/QZDA52441250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368b8abded89d032d8a998e2e802e61084246bb35067c82d37abb347ccbde488. 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/QZDA52441255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c9ceb6d57b12a490b56553f0c73dad592824970d6a1cd4000e2cc682eb20eb. 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/QZDA52441258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x089d75aa592fc56de8994b76f665825a766646866c738077a11367adf807a331. 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/ITOGB2400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250e6db4bc30087f843dc9ffafcc84c4397be191e7fe0a118518bf713e7494e3. 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/ITOGB2400087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x205a2eafb2e9cb70fd9e1ed6ba9947dd1c0a9f06d50ccdf8608b47e4c9f74535. 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/ITOGB2400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0287d2c50e86ff4629b3da8b8e8e64c1e596130934098a2f00c2c4a8151dd34. 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/ITOGB2400091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa6a6635cbd344ce14ca42118f8a230b95ed7cd0c1edf1b29e85aa091ef5b7b7. 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/ITOGB2400092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3229cb2e05c0460b1ec72d232e9de5eaca347384879eb88addd7a62c4b3bbdf5. 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/DGA062319586.
Hip Hop Classic (Lambrate2024 freestyle)