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 0x1e32421adabaed0569e9315d1ece1e44ad9155517a3058f3089151feb896214d. 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/776a0ee3-b3c3-4bda-8f73-03c44f2490e8.json and https://artists.proofprofile.net/proofs/artist/776a0ee3-b3c3-4bda-8f73-03c44f2490e8.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 0x44aa3f359b8d8257043760568d4da193a5aa6fdd1e13356c6f6c12798d36eacd. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHZ31987333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4e9ce32f03e5881290d0c55d4be5c16dc6aed9f5aef35a5b687184c235e3fb. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZGLS1977041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcd98f4e005e35b87609ce08be9456c98617ff9a8020037f9e0a10c42a25c7d. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMDA72178008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7f6c885cbee6eb30012522438d1ffa10ae5fcbbbc28949ffc94e56307d77ba. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZGLM1958355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a452943285366502ddd49c08824cd52435ca3f45476253483eb8f7a72efb99. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:32:03Z), 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/QMDA62126862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b079feff1e9ee5203054f454c3b891186b714231af30552db37fa98262b900a. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZGLS1902080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4e9ce32f03e5881290d0c55d4be5c16dc6aed9f5aef35a5b687184c235e3fb. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T18:01:51Z), 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/QZGLS1977041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa326ae5a2a91832239eb5bc46810ff2f193a2a721bfaac3c6c028a494f2d0939. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZGLS2009759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcd98f4e005e35b87609ce08be9456c98617ff9a8020037f9e0a10c42a25c7d. 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/QMDA72178008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a956f5822ba64901d7fd9be0c45368690e7aa638902b91318e634c896088e4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QMFME2298492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a956f5822ba64901d7fd9be0c45368690e7aa638902b91318e634c896088e4. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMFME2298492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e22ed833dc9edbe24bc3ee6a86257a6f4cd93136a6c4e9d96daa3dbb054bab0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN42434326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0cc83f7787b4af7aaeca97b24c84cca5c1f8f54e33a1c650a4f4a2680edd2b8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWBK2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e9a30393ebe92ab409f171c471a674cb946f8c47bb9f35644fd39f5a48321b. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZWBK2200027.