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 0x8183268a10551c8d526a66c2e78b7469e1bad8b3f4898fcf50bae68b4a27986d. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/afbfd87a-e954-4a11-abd6-5b53c351d66f.json and https://artists.proofprofile.net/proofs/artist/afbfd87a-e954-4a11-abd6-5b53c351d66f.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 0x0e47547c74e3c9cc5d1808c2dea09f1d59675e9424b037870b432d6f08d4e213. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/SEWAT0500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8d8f1e60f88532cee67f45e2c60e5e423c19eba82db7dc0079ccaf518ccb88. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEWAT0500202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bb64fedff756df82494b9114369d922ce38bdf5bc05f2d30e1f9499e833dca. 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/SEWAT0500203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4999a8974465b00e6682115098fc915f0ab802f2398737df09121507184551f7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/SEWAT0500204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8798fd7f58f088c568034db02b37a049c910a89dc4805d01ff838eeb46fa2fa6. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEWAT0500205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ec46cc397e4f37b073edb8110b37d11a679ef8ed274f51f650590ccc37c3b3. 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/SEWAT0500206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fca715c66c18c908719c31083676cc096957c22374ecaa80046f56769275a8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEWAT0500207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23ffa837a3c5b11357b6daf487bbb68b9bdbd81ac4b82475113435914e7c9c0. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/SEWAT0500208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728b44e73fa73892c8df4f02503b10738ba8fb910cf62ac2a44d43192ed02bcf. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/SEWAT0500209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5b2e73735ef4c00216de9d403ded2e12164d501d2d42b507bee649d8809e934. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/SEWAT0500210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96cd4e1107a42a2ca3fddffccc87527477b9f423d1306e54c745c556620a6719. 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/SEWAT0500211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c60d69d4cf4e063df8a23b4e281fef25de4e1a81d7659cc4ce7c06d277f3fe9. 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/SEWAT0500212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785b4100605969c37dd1013e8e8986736429849e4e30559a1db1f15a55b0620d. 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/SEWAT0500213.