thumb|An ant inside Baltic amber thumb|right|Unpolished amber stones Amber is fossilized tree resin. It has been appreciated for its color (orange, brown and, sometimes, red) and natural beauty since
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x032b9610a85ddc5c9c1c003a0235cd8affb2564ccb9014c95a1e54342245e2ee. 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/0851e98a-f62b-44f8-b754-724f890e0b5c.json and https://artists.proofprofile.net/proofs/artist/0851e98a-f62b-44f8-b754-724f890e0b5c.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6618df212b8c14bd43e2e07c4ac572c99f5e659a4376ca2ba8adc657fb095b. 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/KRA301500057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a13142e6b1ec16bb62a8c3d9e1a3ef3a10f143417473cad134edca24df8a8b. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/KRA301500059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572e48d571c39969c848c478e676745087cb41ebe9bf94cb5e03019896701bc5. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/KRA301600137.
Heartbeat (Feat. Ferry Corsten, Kago Pengchi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef9b068cbf5303cab7f4d891a5707d532997ea7e7da016a94dcd7c1a2179c85. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:07:19Z), 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/KRA301800401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74674838847b2a322b96deaacdac6cf2a9d45b57487474d3d277171cf3b64637. 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/KRA301800533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90d1be73bd8667a1bb40f55ed3d1f53650ad2e785077085d70597d2606971f8. Chain 2 (Bitcoin): anchored in block 958678 (2026-07-19T05:59:57Z), 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/KRA301800534.