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 0x66e5dd77f0cab1e2ce5cd7dee0c19afe637f94853058edf03de40716198608b4. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db8a2c97-47e1-4fc6-9bf7-20e591fdbf26.json and https://artists.proofprofile.net/proofs/artist/db8a2c97-47e1-4fc6-9bf7-20e591fdbf26.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 0xa4e0fb75e7df4d4a11533fc7b6795e773b8131f28f80ab1c07570e1d2badb1d3. 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/QT3F32480374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f56553ad909da62c855242fd2abcdfec1d44bd8594b8e916a4a0e44b3b41a1. 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/QT3F32492291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d87fa6131d07c01e4590e6c7cbae88250eb8ee44e5c9456ad38366ec76efb1a. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QT3F32480365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5302b011e75e7439b37399b07a702951ca3712f20623e1222bf5d8b8512dea0. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT3F32480360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebff27dbd894afb2398b13404589fb13f20bb2ec49af8fdfd7b82068c80c52c. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QT3F32480361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde157115bbba694fe5e37ad27e513657393ec2ffaf6c632dfffda17d0dd2f64c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT3F32480359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9598a8b35fe4d938e022b15d626077d6c2c6de046179af731397093991b1218d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QT3F32480367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ae1e7c9c62bb8059d6c5055897f33eb40a20641789b533522ab9af8e4dc0de. 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/QT3F32480370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d39ba600cee23153159ff70da28e607479eb517484bc591178388faabbaee6e. 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/QT3F32480392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebb6ae39aa54026f15e61c12394ed3c9fc4d6d758ae12c49642b82fe866e53e. 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/QT3F32480391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b473972ff320f55a6d6de5e5c65d52e44a9a67e95384e6d567e75841af460c. 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/QZDA52538622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc60e8f5a995b0c93f337c710240d44cf7cb14394911f6753b308aa258b56d3. 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/QZDA52546202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c59f719a4c7c2a193516b6722c67a776fbf20ba27bfb7077160606b412681fe. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZES62561586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968e8ef9e31a63c3ccbadde4254069d770adb56711826797429d7daaed919c1b. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZES62564249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76524cefc5784a27440051edd0f514d0f08e937174eeade58b1649768d9316f. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZES62564302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7896d7642f2d5ef54479daa640b9a014de0e9981ebd99aaba4a0a6e8b9903fd. 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/QZES62564264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04755c613aa2b7bd12ced5158a6788a6402d1364c454928c7739361d43ee71ba. 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/QZHN82503643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d60ec5426e52f0f2aeaa6b5b66dd8102acdd731df4f6631b2b8ef1d8fc541a. 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/QZHN52546324.