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 0x709a25323124ab9ab164b1cd6b3e508f6bab0044894009ebe0716f54802db294. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8349c88d-6b7e-43c6-ab1a-9c7143d526e7.json and https://artists.proofprofile.net/proofs/artist/8349c88d-6b7e-43c6-ab1a-9c7143d526e7.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 0x389508d9239831f002d451b54d9f22e61464cfc63e0d045b5dbc104dcf485604. 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/DGA052280353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa620658db959a047a2f3bb62c6ab5394b38488d14cf7211954c2713aac5bf44b. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZHN52550993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846fd8131fd2acf397d763e2ef752b556a7c18ac7e47245e3364d9568a0f4982. 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/QZHN32586239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e45fbfbe8c641c279eb1c523c17a99b92390e8fed2a277c49846a5c776153da. 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/QZHN32586240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafc635d57e6643c339a81028db738936667024c9b261b4ed520cf0397e0a06f. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZHN32586241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6e80520e3700155f3cec8a34c74ec87b7bb6b48b7625109b9e0b5baf2e03633. 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/QZHN32586242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa620658db959a047a2f3bb62c6ab5394b38488d14cf7211954c2713aac5bf44b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZHN52550993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d215f23c6a0f911a1db61bdfe85ea9ec61a74007ce8ba0a2a044f9a54ede53f. 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/QZHN32586243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4b8bc21d1e9ef31c7d8fef753ce38b93c3d8066a3206e2091debd31c37e4ce. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZHN32586244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4298801a9aace91e38427d842eac53a36ecb83aa3c6beadcdab5477c639a21d7. 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/QZHN32586245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58fafadf577a132171e03a4028a5a2b3f665a4923fdeb14426b5d5fe9116130d. 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/QZHN32586246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd126af1ffdb688bbc98155f8935089dbe5f39b65bb0cb02724cb0227a54254b9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHN52550914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6887ae9c429076630a1c1b511d392a24ef2c9a4ac7c9a1bfc4921782f151e932. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZHN32586248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c29501296845b038a4cc1bd8901f58c85846efdfcf6998bc054478b0806ae3b. 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/QZHN32586249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd475bf5e72cf0e0ce1bc45f472a64e4182b8bf5810d2414da028ab27f868a7d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZHN32586250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d746da95f536efb6b9c87c37369fa7399d69dd2ffacc4e5cbd1e0f65f93e07. 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/QZHN32586251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8165197f66a9efd03c7f03f01cf9bb2224e3110b3752a76274e4f64f9668227e. 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/QZHN32586252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19382c08287a46198a61dbdc74e28de73af394f558c4bc0de3ae1fa94d7cc64e. 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/US3DF2520702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf908deb49faded4ad1064348894ee4c9af5118a718066f1621c0184d0c8f804b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZRP52585422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db2ea3e1ec963f55fde7f0952aee8bda0c912d25461081eba59142c665a193b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZRP52585424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8ef62379323cd9ba7c74f763c78a6cd64cbaf39ecd0f60825453ba0076b792. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZRP52585425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5abf5165096fb6b6a0ad847a33fea919159426ab060da0308172962980f544. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZRP52585427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8256d36760c8827babb4e601606749ef06ae49bd1c8afd99594267b468313454. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTAY2563736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf38934c839666dbda8fd4ab2617d74893845ad381c932f36cea4124260f5937. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6G2575054.