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 0x211e3810c05ab4bf11fba60f68e947a74b9b9b45ad06ac9364d2175d83180511. 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/72638222-e3ac-44d1-b3ea-add2ae25e260.json and https://artists.proofprofile.net/proofs/artist/72638222-e3ac-44d1-b3ea-add2ae25e260.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 0xb60cf950c90ec6891a3adfadbd6c96fa055dd7575e8ddd2e57e57723b8970ce4. 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/UKZGC2400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35026a1cbe8b2a26b631e0d45058a337fcce2e67e6767e3da0829f8664cfc6b9. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QM42K2427724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee18d3759f06857f53d3d2f1b72318d6df27649829fac8a0c1d9790fa8ab265. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USANG2408566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16eed487800d5db66c8dd8d1bf6707c3a42db139a1627badded871e0b1094b61. 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/US3DF2493945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31c3d6a77f7832012208aa0a8ef350b159f766676d9a9a5e1284eb5f57dbab2. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USANG2417714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3312a5a3ae369ebc7aa26d786c00e16243ba90c2bb5a664a8d1c80317119b349. 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/USANG2434016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce5176ddfcb1d99c5db026ba645cdc75f3ca745c8ba9287c00e0564ecf0c806c. 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/USANG2430329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d75ea0a5e9412c5798c93bcc4a643876cc27acc31d4988fc60b694088bfd2a. 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/USANG2436994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6de4ecf2ab6d0deb76d8f259beefd288e4219ed6f6872a4cb0c9c66647f81e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZMHK2476512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945a91a7e5ebaddfda28731679180681b91f786cf9a106c942c4dd2ced055263. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/QZS632439117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3243703238feb45f596ba5668ade9fc759f9f903773dfb321147701657d277c9. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USANG2523764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43451cf78da594efe47bfc35ca900700e1bbba24d653afcba80ac90e953d8bfa. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QM3DF2280679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xace6e945f9d7cbf1fdfcd993a138c12fda4239ec1852aa99012d0968fc3c2c55. 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/QMANG2239609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68cf1cf88dc882a53822df1bce406b6330d523af399c3a22101cf4ae7844ae7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CH7812372938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee18d3759f06857f53d3d2f1b72318d6df27649829fac8a0c1d9790fa8ab265. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USANG2408566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60cf950c90ec6891a3adfadbd6c96fa055dd7575e8ddd2e57e57723b8970ce4. 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/UKZGC2400055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0c2236fb2708b1f0dc994f6c181c4adc00971ff73e080f42a83c6c33246f8e. 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/US3DF2433425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1757555e4821d44318953d926b9ebc9b83085368ba4011a8ed10b32554d51d48. 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/US3DF2468161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8128edeb2c40b2eed19082713e32975516d7b667da71511219e1128ac7cc4f0e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USANG2458968.