200px|right|thumb|Vlatko Stefanovski (2011) Leb i sol (, ) is a Macedonian and Yugoslav rock group founded in the 1970s by Vlatko Stefanovski (guitar), Bodan Arsovski (bass guitar), Nikola Kokan Dimu
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 0xf56551efaab2c6e7f86e5af36f32763f3ba81fcc613ca1e65c0e53e6d58066ea. 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/6f801894-6815-413c-9f50-6e2a23beefd0.json and https://artists.proofprofile.net/proofs/artist/6f801894-6815-413c-9f50-6e2a23beefd0.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 0xa908b9c05cb1fb9e7926972526cfe523eb14588cee420e03fd7e91cfa904b6e1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/HRA040858727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dfb13d4c2062df92b52a8949d7c643b328acf68a0ad955ed9fc3d9cdfe0a8e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/HRA040648775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7764e291603ec9e497d918d71f4d809373c4f0ab9f857b5882e12f9925cb87bc. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/HRA040604924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7650ef7c576fde6197b648e041763772340bc65bfe80b180b42ae4966e08602d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/HRA040858733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce692094ec71554b94da839338fdceae0aa2a2192dfcf1281bf9e5b22cbe459. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/HRA040858735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be1d06a2ee9cfa73eb7b54f4068b3686a6c0a81d1d68a0d74ec229e12f91352. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/HRA040858736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39870a6ea44ed60b847b623db71b0990e65bdebe7e399d787c2c9c0d36ca5717. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HRA040607437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf69dcbd217ad6fcb0545726b3886bb584a1faf6d166f8046efdbaa2ee44aebb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HRA040618117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555d274623333ea6b5079b51324ab508e3e938d358560a576d693be56efb615f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/HRA040618120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01bb17035f8a7c82b42771d2e5190626fa742453da7327fc3d71ca9cc0ae341. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/HRA040607434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011b1a6a07c8cfcfd4e509945c82deb930c05a8bb9c3dd914238bd5e2cbd9ae9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HRA040635334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345eca682096a3ca046451fa88eba766faed9bc65ca4ced39b3db82dd4b3243a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HRA040607447.