upright=1.25|thumb|The night sky over Slovenia in July upright=1.25|thumb|Cirriform clouds and a quarter Moon in the blue daytime sky over Germany The sky is an unobstructed view upward from the surf
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 0x1d1405421ec5c10f124c96ad9896c56816e465cd82fe18866b3851c0b35d10b1. 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/a49dc482-9e00-451f-acd6-0b87d2da4b8c.json and https://artists.proofprofile.net/proofs/artist/a49dc482-9e00-451f-acd6-0b87d2da4b8c.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 0xeef91a0db163a3ddee381375a1a74f5b92451d0061c3f9068b52742abb9f9b47. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFZ42167010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab271a7dd2d9954542e69f58c116e3a58e90f05746e84b77ae44cb76d1e2318. 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/QZES62157050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fbe24e1c8a56b19d910155926a949bac100da7659d6e99f8fb8de8ca8af2b3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES62157051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7602681ba99c24f6db0e969a55239ff3adde02ebc3068e0bac42103da215c58c. 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/QZES62157052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb2bd7074abc86af5fd6e486da7d6c4a96af10e565a60f4a99ef3f466a23e1d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZDA52120902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56412c4c2695bae07a0b4c55cabd872d8d86393bd8443b374e374cc97d913607. 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/QZES62157053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e29bcdc8c74a1d1873332815c630d1220e99fcdf5aeebc6ae84575c0b0dd61e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES62157054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a877eb709c45b64a71944e96747a2500b452b91bad21242fbc34e8d0a7fe997. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6M2291271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81db812554998bfc19e681219d2837df146a64f05eaa8ac474827bd0208e882. 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/QZK6N2127031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1182bbd0b19a6c5b8a84c11f59c79ca3c466e30dbce5489439ed61c21be553. 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/QZK6N2127032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7dbb8f9619e1b6151550dc5899eff282dfa4a4e99a02b2fedad1add06015626. 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/QZK6N2127033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e4e0765403c396c1f1702a02b148a8afed08c13d8ccda4eb73573cf98cfd03. 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/QZK6N2127034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb2bd7074abc86af5fd6e486da7d6c4a96af10e565a60f4a99ef3f466a23e1d. 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/QZDA52120902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef91a0db163a3ddee381375a1a74f5b92451d0061c3f9068b52742abb9f9b47. 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/QZFZ42167010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a1a7bb0021997ff37b642af22668fd68e6dbc927be1cd8ec441825036f547f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZFZ61977355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ed41bf14f1f30da0cf029faf10b0199d182f2fee15aaf51e63259b7e49ac54. 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/QZDA71898834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcbbe27ba624798f42fd2c699e1e92fa542f99cd0120020c51a2bab57ba079b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZDA61817915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a89390d70662fd0b94727cc4473763babdb547659430e68535340a84ba9d7de. 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/QZDA51893363.