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 0x19b6782dd361f22351febb199bd8d88ba3233d930155ad23a23e7a9d0c088f5b. 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/f9202f3d-c8fc-45e3-b4fd-80adefa35089.json and https://artists.proofprofile.net/proofs/artist/f9202f3d-c8fc-45e3-b4fd-80adefa35089.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 0x38a815716e2e5bf90e768c37b61a3ab0d8282a7c47a394327b91ebeefe9a0c12. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/FRX202132132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa97542c6f25765fa8bd174cf56cd14175b7c0ab3ac469d5efd464e2a854ffe. 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/FRX452101393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd151b435507c63c9bccf45cb4e4028d9dede98bdc1c332dc2bcdf939599c80ce. 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/FRX452132356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e798c7ca5ba45e80b6acc48397773b8841987237fbe2fd6a1f0a02cb33bec00. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/FRX872123653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2f3104658d78c5dbe9cabb8a89ddd4da51477d98dffc7ef9d43340cbb150d8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR2X42201167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d3d824a5bc04d195c92c44961d2962b9fee58411d6ec175f674db8041ea555. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:58:59Z), 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/FRX202229425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56ac4f437db75eb1cf2b88334af6804a492ecfb81b50965a9af831a136266cc. 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/FRX202229426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc014a0b9c8b6b11f2261a2235d679ceadd6d13d85f03ec3f46340a7ad6c3f6. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T18:32:18Z), 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/FRX282206206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d921ef6df42e9be2ddd11ee2b56ea24c09b4f9d679895f2fade173d1cf0c7aa. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/DGA082275426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fb22d0a99871b743208b8812aa66b24fda9c96a8fb79b06638fce686a69155. 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/FR2X42330086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6476e52324eb3dcd005172643ce31e07c2c5ccef0018bdbb43e9536dd1eec14. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:25:09Z), 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/FR2X42330082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab721c428a7882c21d0ed3990a72229e81d2da3de4922c3f7c7fb93bdfbd967b. 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/FR2X42330083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b594ac7b36ca6a695d238ca50d2fddc200e5fe858fcf25479c907b654c6b5a. 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/FR2X42330085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe97b606e0c6eab498a7e61d485c8d9a4108bc4cfae11cbbdc2e52701a88ba1fd. 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/FR96X2380590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747ae261a1eb6c55cd3a72dad8e4434367d7472b1861a717124afcf399a1a08e. 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/FR96X2380594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba75735ab8686fe6b1cb7063a6b9f8ca05722c29e2c54454d3fa4e7f95aa8fbb. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:46:03Z), 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/FRX762374083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208c13874187cc78a6fbb41af07649c7120a14c2891d42d1f7c19ca79f627990. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRX872364361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8f3172d9f9455607fd454398d45dff5dcccc51ed1c406900efc09842ee74bc. 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/DGA072341407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f20534f422813b0d3de5ec56e9c7eb7dbaf058e17f9ce1f1cd82246f33b248e. 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/DGA082384809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38f13f3848f24967b48eedbd1aab539e56266b4a20190cc3ec6715873dc6879. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DGA0M2336969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dff97f42d4009b894f236567b772bdd2b7a572286280ae6b469fea305d0f3e8. 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/FRX452406166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b13ace380bfa11da933ff87f11fbf411f201a4c1bd29d7e6cf5cf57a6b12306. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/RUB422401622.