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 0x664fa24cba9e5237507109046e21a2a4a4708602edbb6c1faae3a1c1d44dfb58. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad75af14-ed68-4f04-803e-9f227ae708a0.json and https://artists.proofprofile.net/proofs/artist/ad75af14-ed68-4f04-803e-9f227ae708a0.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 0xc1ef4b577894f48263448a8d65c714c10c4d2fa44fc8c52296ebd33fc1e95d35. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZHN32130388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5832b68b0031c7486e2442aeea706833ffbc5f434ad9a8b79faf19a7c724a57. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHNC2155604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20668840910dfd0eca2eb7617f23587a7ba4245d82876e00cea19e8b465b2d6. 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/QZMEP2173436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57293c2c004b4a2e2356b4424be5c28233bb234a09f4395b797beb02b2e4473a. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:13:24Z), 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/QZNWR2117024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b41cdce57273d1d9910d85399ddb435bd5d018cfa98497553e5412fb8b895f. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/QZNWX2197319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f347fc38877ab51d9dcf576a2197093dfd54c096631f4ec83f513c35cd7f06. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZTAT2101065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790b9e36f90dee8b76bbf3c420dad34e09c8039f4970ae69514de9b533a3daf7. 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/QZDA82273581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2371c4cd1b784c37d98880d67953c34f3c0d65d21ef3a42bf79ddecda77990d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZK6Q2296121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe772fa9297ac9366b279f3d648e2868195334f1dfdd6e9fdae1e66e9fd8648. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/QZK6K2205756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba8a8a00bcb72636cea87757fb0ab2a1b074d1e305f608e2fc027f57f832c3f. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZES52370331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bc833fb10f0d0c3bf911b75648a392d44bf86d7012f8212562b460afbb8422. 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/QZMHK2230341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca46ccd4e34d1d610f3575ea475d5694368452773a60173a02ff56107605cc17. 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/QZNWT2135185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db3fbcf1bb61dd22d3f1c12ab935bac4d10d5b7e8416c65c3513f4f3c1ecf7f. 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/QZTAY2471036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e1e5e8e3a657e8ecdb8c44c37e49b12ec43e8ff7b0684c5f49b7f5478eaf63. 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/QZWFM2431274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c513b8c1f7d4ac39b83fa3f8d3c4a4bf226b5a8e8f1b659dacee16c4ba9f9f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZFZ22281035.
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