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 0x264db9d3ef8d680ee865bfa6b77b4f241a0be228b209bcdf5dfedebe84e273f8. 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/dc4974dc-99de-4355-bb2a-08d58a528d6a.json and https://artists.proofprofile.net/proofs/artist/dc4974dc-99de-4355-bb2a-08d58a528d6a.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 0x1fb17c93fb9482a631a2ebf3eb2a63ee59270a25cb668e52a73a23735edfbe63. 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/USHM91379465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e455ac6dadff7bcdd32b5d0e67fbf9889be795d1e0467e2879ea1b3132c971. 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/USHM91379466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaada2c442699ecc81a237a5e433326b91b9235825b25434507e318f13025a549. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USHM91379467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9375858ea40d0de6230db9f29798b7b1ee913edff93facebde7390c3a5e6af4e. 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/USHM91379471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6db6637077f007760decbeee44015f770d1865e2982bab9be8676c2b5c4aa09. Chain 2 (Bitcoin): anchored in block 957835 (2026-07-13T09:48:24Z), 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/USHM91379472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d76cca41a625639046e781a70bebe3828049594385f16206150e51c65c9a0c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GRIA11600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6854a611bd3bdac15917abc00818f7d886bb60d909c34119d7b77a13911d4f. 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/GRIA11600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4b9e79af61ad1881341e22d6ac5461f315c97ddac2c365349c73a11a10204e. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/GRIA11600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5da717fef37d4bde8c69604db8b422538a9cc385d85644dfa966f3f31373ef. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GRIA11600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6881daf26bf152a506537dc792d8c48cdff47f770b723fd2463a168be7ba445. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:46:49Z), 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/GRIA11600010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c680c0ee82fefcf067709670c4d9c2864b932fa350433aaa697c6a240ec8654. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/GRIA11600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbecafb96abbbb304d344ee8aa194f85c064dec0cc37f6b0d5a560fba22742e. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/GRIA11600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce313565a966ced9c4b6c04ca266f3f0a306542753db4ed65adbb413a57b39a. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:42:48Z), 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/GRGAD2100001.
60 Hronia - Zodani Ihografisi Sto Odio Irodou Attikou – Festival Athinon 2014
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331b68f224131bfc283e106db934232a61e584b04f5f70a0cbfb13bb3e370f13. 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/GRUM71500671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc417175ced9f6b222770136f7c9c73a8e613156d9f369b1d80d7ea0ac5d160e6. 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/GRUM71500672.