thumb|350px|The Creation of Adam, a detail of the fresco Sistine Chapel ceiling by Michelangelo Fresco ( or frescoes) is a technique of mural painting executed upon freshly laid ("wet") lime plaster.
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd898dbac83f0dd7c1c1a8792f622abe235767b2a4a7735fe92189f4519d7b843. 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/244b3b3b-e850-470c-b7bf-abf6e8ee3dd3.json and https://artists.proofprofile.net/proofs/artist/244b3b3b-e850-470c-b7bf-abf6e8ee3dd3.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb98bf4da26bfad8a355ecb17070ec7d5494d859c23926a443494abba2f3efd. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/FRX201952946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ed0e8cbce4675d4152ee34c0993b6f95b4442148366734dec12354bb3ee2f1. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/FRX201952948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304f67559d08127b2b03b8de091aa8a0e7b3a035642b04a3dbc09b3366f9f538. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/DGA072181313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5a6735e3b4a532911edd0d1eaf718f73193c0639cafc868a91e76f6a4ac45b. 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/DGA072181314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee58d54ab6efc89681e4484881fa4f1b3c1633b2b6821352539ff20af174c06c. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/FR96X2155933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dad67eccaf2444d4e307305f78780f1881c29aef8ebe6c17136428924f27a1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FRX452168806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b1f9dbe1e462308ac596b0275a5a1da1216b36fb12c1fdb6af721ebe2fb7cf. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/FRX762120465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee5f778b4e77b23c5153403721f7d1575cb50d388051eaea4f9a6efd898d9e6. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/FRS182101153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd537a041a97f791c2ca2564747670b47ead920345dea8337ae69821d3af0d24a. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/FRS182101155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d0213599265d192c45d5a7b50e2b1f330c12714b65667c9795f0044e69f1d5. 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/FRS182101156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8ee6068c04f737faf4a4327dbb150d592235b3194901589567681c2e8e7f10. 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/FRX202355143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369f80ca275eb78540dc749717bae853938e732942f8a5a62f2c2b0aec76d723. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:12:29Z), 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/DGA092312998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1dbfccb49d2b80e052a517afc41264e7ddab57eb9809da97a41cd067051fbd3. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/DGA092313000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714f194e3e8dfea145102d5b7d86c9d7cbfeb3c3346108db1bfb305906d3d48e. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/DGA092313001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a751aacdf694b0d8f23839dd542192fb26ad353116727675644d34f46567c15. 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/DGA052464074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2daea87c2c521c144abde55a3f4e9235d40a27111058a481b52fa3d19b19d727. 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/DGA052464076.