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 0xb04100c2eeba042bc9ede5adb9899d7b040bb8dcbb0bb6deec784260d0e86ee0. 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/d3568f44-738e-4fb9-b319-cff60e6e93bd.json and https://artists.proofprofile.net/proofs/artist/d3568f44-738e-4fb9-b319-cff60e6e93bd.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 0x4f712725c69d104180d9b2774c07d10f2f133c185bb5bcebc6398854b33c1e73. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QMBZ91956392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc1d7e35e14b1330dda3f568c7d239a96b7225aed422faa29c670de7216322b9. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/ZA3KW1700020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6957860f95d5cb908de9b4e1363ab733bdb3bd7b2cdbbfb30936945d180304f9. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/ZA3KW1700022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc235f4d5d4bcc740c73c1eb0eb8092de84b6d817588dd773cda5b6f1f8f408e3. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ZA3KW1700032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0312e7e1e0c1857f9594a93c3e57d6e7ba8503b7878a38757b49ffe37f69c0b5. 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/USHM22189855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b54d7b783a10d29d6ff145d34826772f95e91cdb7a3de9df237c3ff9386057. 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/QZHN72281344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ca8cad3172059f91ca971a3f8dc3589c26607c584b950c6fb1811af578b7aa. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZTB22313561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c488d16441b5c74a14cee2f9dfe24cfef4cf7ae5dedd36d14c3d097bc47556. 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/QZTB22313565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568f1297704c54d619231853ea4d789d08f0229cf100fec63248b8d5c1d22b46. Chain 2 (Bitcoin): anchored in block 959009 (2026-07-21T13:14:47Z), 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/QZK6L2457600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e75b3f0bc881c084c97b26a0d495c5e6046070f1496ddd4cd8887f9eab5640b. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZK6L2457602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97265deb6fdc1239bd0fdafba0b2ac78aaf3507d2d622922f2eaea696a773e39. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6L2457605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7549c337432e4325ed986ac7480f8f338a2be8647a61a6865749ebc3e6ff9e. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZK6L2457606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712a2def6d87b13bbbbb44a4deb4a24aa882f3a7ce34bde82b2045ac4f8c8371. 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/ZATSD2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27429b27cb9056d1b26a6e33141a94baebf0f1f0203d940d8ed24c26d5e93452. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/USHM82558448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8563ca491a1efbd9b34e57d2bd47398ac246d5a2c6bde2b5c0dde8fb0797fe82. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USHM82558449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f900a6bd25998749396f67929d377a9df82bcf35034f730c42d5dcc94e79b90. 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/USHM82558450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd18bb4c2d02c83abed62714d890af07a3daaa9ebef255729ec37c268ebd13845. 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/QZ5FN2329795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf906d99b5ea79612c3b92298e9bac0221ea4d1e27f46b3f918bf289d79c12527. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ZA52S2200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c511321bce9bdb8b4a2e0fbaeb3f083a025b77ddffc95e34a812a64bd0e81b0. 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/ZA52S2200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c760b50ed489851b98332c9f1955ea81b34aa5d67d5a889f1699779784f8b11. 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/ZATM52000020.