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 0xa3454ba6be5271baf3424b47b48242a8e4effb87b72657fa28ca792c016c009f. 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/c73923f2-8f42-4b05-ae87-0e722d7b18da.json and https://artists.proofprofile.net/proofs/artist/c73923f2-8f42-4b05-ae87-0e722d7b18da.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 0x53d93de70824d78846fe6d6f91c6094743b468cb9e9c4042bc36dd85f36f732d. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/HKH441800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831ae8ab8c46a93d1f701655f1e0b2225012595e37ce5902e9a5bd60eaea0582. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/HKC491800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c9c8aa15142c11975cc74b60f6f563fbd643611d8f869eed8bb212cbc8df457. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HKH441800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d5dc34acd74b43ee2a3108a2ff6bcf5c28ef115ee654ad56495e09642d2929. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/HKH441800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ada051b6793763c1043776c0310fd64cebe8f41d1cc4dee51419dadcf5b9d2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/HKH441800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63eca792f97c713a2334273f793b491829297a762c4ba70bff87053fa9aaa029. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HKH441800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa3afd1bcfa239c925167576714f6d74851b2e3c6dc56fb8a8a6e8e7511ceb9. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/HKH441800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9a4f0b6a0000aac8c47afca9546f706d99f651433c7429c2eb7436387d1fc3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/HKH442000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5704cee158fe89c8f7be5a816d91c990a508dd178a5dccafd95916eb839e4dc. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HKH442200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda90997f44b008730aed3684fff724f6a0aa74afbf7b2ad8ab01bd57652d01d4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HKH442200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84b1c4a2c095dd90020b0221a1e7b60ae8b5b5765a4b2ead0020159069bf16c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/HKH442200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f25d9fbcb3dbe3ffdb8b95b1114a3bddd49d1c7e3e96ea2f2907f5140bb80d9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HKH442200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5182ac83cad37d9a1ee4c8877f2a82428481d3ff2048d6e97551074126bb88be. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKH442200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76a268a4b7e20f30d836e944a87664cae1c1b51182b8519530ad6407258ffb7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/HKI492366203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09aaff70d7d94082b160aa59003ef06e4815cdeb472d2cc86992db0c36ae5c02. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/HKY492466203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ff33f086c5e8bc7db96c801b32b3760ff3269970ce24ff04907013678ff6c5. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/HKI492566211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35fcfcb3afdfe52904d7d7bd6e090e877cb92c7a00f7002d5ebaec6e193cce9e. 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/HKI492113205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485a46d3f7b9d4859ea9c084dcb50ddb874390ebb283ceac363a9aad64000dc9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/HKI492266201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76a268a4b7e20f30d836e944a87664cae1c1b51182b8519530ad6407258ffb7. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKI492366203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a2e193f80d14fed6defeaeb206c6b44527807ef9a2779b0fad5221dca326f8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HKI492366207.