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 0x10bc4ad853410a0c79e2243e49fbe561dcd3ac0f8899e7f9eb6ebbc6f55c167f. 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/e2ccf5c6-cf96-4e5f-9e3a-27a3fd6a7bdd.json and https://artists.proofprofile.net/proofs/artist/e2ccf5c6-cf96-4e5f-9e3a-27a3fd6a7bdd.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 0x93e7a2bdb7ac6ab2ecce86abfc88e6af4499c95cbe3b7167b8dc2dd19d64ce3e. 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/USL4R2112371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff028154a659ad35ab401d7f3013912ce46638d659bfd356024617d1b6b3b82. 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/USL4R2112372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61669c99f05509b2bd85bff666a12425da3b4a6bb3aa6307a3360ae9d2f1516e. 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/USL4R2112373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958d6d377efb7534270bc97bab72d02aa030daeca90db19a6882af484b4ade5c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USL4R2112374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc13eee814d3838652aa49b3422ef3ef4c826fe4171458155e34b642f8da7251c. 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/USL4R2112375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e52474b4c5d5bbd9aaa213ed26967b7383912bb03dad09909abc868f9aee73b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:00:51Z), 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/USL4R2112377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cab5342c92c6544a9edf2b808a5151cbaa06c88b475d7e543adbd18be5dc69b. 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/USL4R2112378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6806b598312387464c06987e45fe9172fc5833c8864cbfb2186df1f99ea7e92e. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:28:06Z), 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/USL4R2112379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f11899487dfc2ae3e6cf4df23571c010a5e41253cc472f1c78a0356cbcde6a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USDY41819850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4472959ebd26c4dcdea497c8784516b9dd946d904585caf4b4658695a5d4421d. 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/USDY41819851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e839c157785c567f55b24ade2d3c2808ad7280e28daa439512cab641aebd9de. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:10:16Z), 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/USDY41819852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517edfcf8dbf6b479093181ab0f36aaee99fba064f96adc28afc04d3ae4aaf79. 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/USDY41819853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb569d7fbe8b3ca53ab912bb5143a254d9300c863643bef8da4f7faa5325a7198. 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/USDY41819854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53f0e7f0cd63e060d2efef32ff1508f396e6e995830b3337d686b2e624aaeab. 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/USDY41819856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69dd16a4d88c0e72b120f718eab2bef12706badddc9edb1cd99bc038f3c2e5d. 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/USDY41819857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6189601a4b7a3281ca14d71da03d8e59c3d28508752dc7e427c1c0dcee1f877a. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USCGJ1683304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x157d1feb907a55c49aece0447802f37656120bed4c863a0097ec99efd2f454e6. 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/USCGJ1683305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81ebd2761965d4635aa5b303f805015d7a3e56f4bbe213e38807cd533363164. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USCGJ1683307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93655579954176568388a5bde99a065e173df0f683175e4bbd2d14c97e530552. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:26:53Z), 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/USCGJ1683308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98fceec80fd5ec3154991d406105b6e17ac5f7f48f99f4d5b314cdfe081075a. 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/USCGJ1683309.