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 0xa763a33a10db3281c54516cb747203d4170e44ef2c417882a0915ecabc87c22a. 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/7e368f52-ffbb-4464-9395-8ac2cb8fa9cd.json and https://artists.proofprofile.net/proofs/artist/7e368f52-ffbb-4464-9395-8ac2cb8fa9cd.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 0xae74e3836347028dbde5dcac7d9f6e5e88bbc28d1c419ccd26f47c3b6a5a9054. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/QZ5FN2317248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35aabe93474ace1cc0799eb2c105aa78a41722556a67596fa46893a46c3efe9c. 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/QZWDE2438396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ed2e8ef9c86784e680af41d2e74851c797124fd8659bcc84b1bfa3f2c2aa1c. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZWDE2438384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9e6378d5d42f59137980e41ff13efc6ba4266adeca1c181a1d238e86d93b77. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZWDE2438386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe115a0073bf19014ed4a5206a5917f162d7fe176ffa05c917188fd2476991179. 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/QZWDE2438393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35aabe93474ace1cc0799eb2c105aa78a41722556a67596fa46893a46c3efe9c. 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/QZWDE2438396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c0e14c74682167626426cf3d3abeac04a7192c1fda753f4f8623404e4f1a61. 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/QZWDE2438404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8377070803383a1ad738b66182d9276e7c0fb6f5399d96407aa99a91d588a4. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZWDE2438407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f6634736c65f6de541ac329f35521581a9a11f08630494c51b0bde5816417c. 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/QZWDE2438408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0687fc3a2a3a4224a5f0c9e5e56c756ee0e129024dc0fc742a93dc54f8047c. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/QZWDE2438417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc27f402e210ec2e8221f328b165e4f90d3838118d40048ed2c09f7deb104eed1. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/GBWUL2571014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4aff23fba7ccff9411d6fefe67820c2d978578d4bdbf390353e2a672e2eb7dd. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ8A2528894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78da5821d397e8b197720648cd20dfed430674bff56d49ad1f74c851ae269e1c. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZZ8B2502293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6c0ec9bb128fd9c4cc5eb9ac8bc15eecb3a81d93a6f5ab8906367141d8c8ef. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/BX4KX2400054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3602ab6ed5d721ba1a9fbe0b5474bb3aadacb271781bce821550fd15685afb6e. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/BKKY62400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90cdf62b3387820ef3bbbe77cee029586e7cd95e9ccb8f4ccdfc2aaa9046b46. 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/QZZ8A2424208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831a9943585e4c116e5d84f69b5591aba4dbc874f06258386d62e6af038c27eb. 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/QZNJW2471131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60cc5cdf8c21fdb97c27149717078109c3981d41f8a3de58bf21617c7b052e7. 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/QZZ8A2426424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a78031bed5f9cad2eb5788c04112d1792593b202b013b5d66abc54c6702a902. 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/QZZ8A2427650.