thumb|Dzeltenie pastnieki performing in LabaDaba festival in 2012 in Latvia Dzeltenie Pastnieki are a Latvian band formed in 1979 in Riga, Latvia. Their name means "the yellow postmen" in Latvian, and
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 0x847e152851cda5f7806099322ac85567cc245eed50558749bc5df4b306eedd11. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c8d2748-5cd4-499e-8dfa-d57bfe52fb73.json and https://artists.proofprofile.net/proofs/artist/4c8d2748-5cd4-499e-8dfa-d57bfe52fb73.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 0xebfba65aa7e8df6cb5a4dbcd53b27ca41c9bc36ee270845f652d5ecb3651b0d1. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:30:16Z), 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/QM6P41405532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5963da5ad00bf91be3b22f1d7df6076c75b6852ede9340efdecf114181a8bc. 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/QM6P41405534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d44d7c116bb8dc5d9759ac705843e02beab98fafb35fcff83941e5989f9da1. 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/QM6P41405536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918d9dc12e8a701e82712ddbc7020490773e8bb70346f5722828f98925380072. 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/QM6P41405539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ea406b6cbaf46429f7fd9aadf30b689fef796f75818c1e886af5117f6545a0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6P41405541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa096404182990d6f3726c485b5f868264f731182504f032f6b14c884dfa974b4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6P41405542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a4d0257b503da9d3d5c41d8d763dc11322bbb073d767c852bb5c256bf902e4. 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/QM6P41405545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862bc44ba27b796b88a9db09bbed578022508ad966149b9b5fc836aafe10b986. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6P41405546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bd147f0dddcda379c7d2c06201793ed9377435bd4153c1002397608b884d27. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM6P41405548.
Latviešu Roka Tautasdziesmas / Pirmais sējums
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351b7d4b0c9fa860f5526392e345cb7b0addd8f1db55db6333aa831a2ca85a05. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TW2036661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff54321f9c92364c311e532a4ea94794b8bb067c1db6c479c96f25e35509af28. 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/QM4TW2036664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d340c204994c2e8e4a6e0b9b1bc6eaac2cd09fdfdb644192394ddc841c3a615. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TW2036668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16b00b0c805a51fd23ad312a59497edff6d28414e43e9da24734a84cfd7a378. 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/USQY51763624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64eb3ddc51b051cd288311357d227f578f3909ecb7cff0c767ed16562c674141. 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/USQY51763625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedcba3c50b5fd26269aff3386e9e356282f23349645e83564dc55ae539b018cc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USQY51763627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b6195bceac6042670670b5328345d2fc7ce239ad0e2a2cb50e591fbe7ee6e12. 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/USQY51763628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x123550bc98e1d39d2af6532edf0d2b443a919cb63d5c2d61ea30e501312949a7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USQY51763629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442ec00c6f5d300b5f10a8a29254fc12da487053f1e48c2d1e97a21453550752. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USQY51763631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba20fa397564ec4204c413d7e9f52668e8ab24581faffe43cf6a0243e958330. 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/USQY51763630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7925d19c6f02e7be0ec81df238757f9ae04ba8015ac1631bbd19cf179b2b231. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USQY51763632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8e0dca11cca8fd04770c65a2bb23b638d0fec25eb6a1f0b149ba2d92511467. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/USQY51763633.