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 0xfe4b4961a0060fcf7e75ab9d67b01d0cf09b40f36f45342612fbd0a4abdccaa5. 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/9b720f8f-bd41-4488-b7f9-e1e92cb8f25d.json and https://artists.proofprofile.net/proofs/artist/9b720f8f-bd41-4488-b7f9-e1e92cb8f25d.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 0x8abebafd6853de190106313a041c03057bf8c610e85ea128a37fdae64584e710. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BC0O12100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ecd3af8da61f4ecb92290d39dd6ffb6030cd275656d212b938aa467f06ec1a1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXIV82460881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f2e900d316eb5f6ffbdce2a50489bfd19b2ec947048a41b0322784fb225d18. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCA2A2400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f48cc37a8f745037046c752f049e4759e4a00e0f496367ea90dae97beb84b5. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BKOUP2400051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83e803f67340c2737336cacc243439a47f8a19b2e9607a99b6bc351f25304b1. 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/BXIV82367872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4aa5f0a8ca752c31a9dbdf7e2ec314966d93cad8807fb5119128354a2e16ec. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BXIV82394468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e3b54c442b3bacd8b7175665c8b56636b0a3bb0cbe9764474d02cd7bd653d5. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/BXIV82307882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26dce3cebfd66910cc50629feebd4c5354e0a9adf6c591083ce96678300e7e7. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BC6M22414171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f0477c283dd072717bfd2083df5982711bdbbf1f8af3d8d493289516f18bf4. 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/BXIV82404663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd527525d4378bf44e33cf5a208f31fcf288b8a4cc57ce568cb7d82614194d1f8. 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/QZTV32586747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851cad773a4317e31760b60f894b504b321b606981cfaf3ff9d0915f186957d6. 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/GBRKQ2552119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d5e7b354bdcd6f403602507d013fc162e91c64186e3c407f093d968cace4ee. 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/BX4IU2503145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea4973fe0b2a025422bc71b3d37aa085731cc9e57cdf3263b4fae82b56eb7e5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BRSVB2400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533a9ebd123cdce1f96fe43cd667b4802ba85771b239cc919b5c896b31af4bf5. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/BXIV82498369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2570059e19b342c148b313506b45badd4899ef2bbe58436292033b48e43aed7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXIV82354059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3711e7453a8e2dd9aa644e8aa5dd753c58c37129530c1624169a68b4670f455. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXIV82357497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b57a39be010856957042f9fea0f4ffd87bd336994d67855038fb198cd11f0a0. 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/QZNJV2332608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c388240083df5326f4a04cbdf46536b2692a2f3f6fe4dd9598cd99512d51531. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZGLM2368421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb22c62d304563a4b6f7944f0e70343b19c7fd221e7aa7320d3f9e572496197. 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/BC6M22538920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe557c8dcb9e6771a7d1e4ff04b2515a6ff545b684e0d904b96a9e76c766e4515. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BC6M22518448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2818d2a1867609d87abacbff0fbea2b6a5f8bcd8886ce4aca0a4dfddc78ecb26. 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/BC6M22518970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa245ca6c33606b164ed20d26715f911807e6ff48c43963ee447cc5270a251c3. 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/BC6M22585097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbefbb1dcb27a292d86381b8319434dcd69116183daffc779ba3112e64e41eb. 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/QZNJY2415298.