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 0xf9ee6beed24cdd9f8702a7aea063ee2e2fd756194554d5d807033c967ec9d771. 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/4f9c9fa8-a7f2-456d-b571-e8f0d55353cf.json and https://artists.proofprofile.net/proofs/artist/4f9c9fa8-a7f2-456d-b571-e8f0d55353cf.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 0x8a0164c81975fc9b7d14c6a682aafe87794d772a6fc66e528637dbb9d69cf67c. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/CAHQJ1839313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1a611eb708b7f1aa803cd030fea6fa8f0cd57f454ee4c490c82b1022e82126. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/GB2DY2200596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22f3f378286f9f075991481ba885807469d37d7bd62e96703290f2d8e95afcd. 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/GB2DY2200580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f10be8d7addb8712dbe2b01d7d23ec2116c72c139fc40e9f2ea32f041c5bc3. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/GB2DY2000595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6100a841bdb5701e10501d21cbfe6ccaf896db8e8547b2653b7fe82d67eb56. 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/GB2DY2100385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc881688e8e6fe4fb0e5dafdbd4a1ef2badefe99c39c02290256c93567594d80. 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/GB2DY2200585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0635a280f03af54126f14477258188c72b127d548c6d0c00267b392865505d08. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/GB2DY2200582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87782cfa71996a4a88595fb745fd35ffe6e713a78d2eabcd10965adb3c70cde6. 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/GB2DY2200583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29e6ed4622701431719e6cb8b8b3ad333a77c5c5fd9b5408f192efd513727a3. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/UKN6K2300629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x820f069c10b6bba667c1d2d6ab341eb8c4d00437e79c25176b2eaba51deb63b3. 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/UKN6K2300630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f03c91e77420b6afbad311beb55f8a0c6f0471f672f2fe23fa2e00b624cbccc. 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/QM6MZ2454008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29640916b8e45b0370bdb89b8abc60e50ed023815a37b81c38b5613a0684c568. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QM6P42406041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e5b793acb7ab5c6e0630dfaacb0ca3a9d76b3f80e45de3044910c0dcb68786. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QM6P42437525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc440a594526cbd738532035ac101309a381ca2597ecac959184abe71a5400d. 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/QM6P42437554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c4fc9ba83d030dba9676cff19f31337174d7309b2e04698526b4656d00ae3a. 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/GBEWA2301598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc294f182bd9f6be0c68b801bf82bce8a6c69bcc725a7cfc117663d3f26aec1f. 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/GBEWA2301532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99f7967cbb36e4aacdc1450a4440f138afa5eec357ae539dfcda270b3378a7d. 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/GBEWA2100358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28eeab689b660b6fa34e8c4623466e7d33bb1830ae5b74da6ea94a7d63d047a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GB2DY2000363.