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 0x4c75e657bb2fb927a481fc0ccd105d3342d21ce303b6285e3021661115cc7989. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f51d2a4f-534a-4200-847e-ed3da14d38e2.json and https://artists.proofprofile.net/proofs/artist/f51d2a4f-534a-4200-847e-ed3da14d38e2.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 0xb266ea0553c8604782cafcdba700703a44216b86317aed666f6ebde93c10ccc3. 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/TCAFL2140512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x981a6b377214a4544bcf3ffe39775494b02e3d8868697081780e80b8af68508c. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAFP2192122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6b3b6e4ade4670ed0200015417451f00d47438647292ea55c620ae8bb63960. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCAGN2294971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85baeaab0bfbce6ffce10bd1856fd8d537c0277d19ab480e4b1fb96492daaea3. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAGO2212722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348065136046ed9bf2ca618add17d99b750c43a587cdddb4c0c1c241159a4074. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/TCAGN2299201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x106e7e5e3fbfffcdd9b97bfbda8b5b5def4d953dd0651ee6300a08bc2d8e549f. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCAGO2212274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f44e13884bfa6e00e6837cab6603cf7c976a9e86045fefde8cdc5daf175d087. 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/TCAIX2462118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x299553b89c47ec89d2cb2a3c68d3f205d9604f2eee7a7f9bb4545cac26e4b223. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZZ7Q2493375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf144c20d89c80a91a0cde3f84f4a24ea472d8cea6590401d7b4a9b2647f9e790. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7Q2493377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee32ff50410a677ef274112d57413d84dbfa31d238aa36e8f7fccb34d694b92a. 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/QZZ7Q2493382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130161707f3ece4d07e93c61152873c86e0b40e21277ac5088a1453169f3f5e6. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZZ7V2431193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d83ec71300863ab24d60e8c0e819e56bdf5a1c618abe0f23f596eedd0340733. 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/QZHN62536048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6226b1b06fd310d2aad050e2a06e052cff265e25e21bae9491bd3b4c30ffb5e. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZK6P2589893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe4758341a50df4cb043c6b804d30dce0f0e372e48a210554fe8592442bec86. 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/QZTB22513563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618c295419fed56ce1deb6509720782e94584384d9528ef374dff056f0971551. 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/QZZ792583601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588f1077f4da387df2e43745842b25a99ff1b8f3aca2f5bd95c669cf56bd9a5b. 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/QT6E62586772.