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 0x31d8577aa92b4936bfe221fbdc5dbd15d6d6e4ae1b5ad19ad3e061788c7fc73b. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad2916cf-7e6b-4ba6-b5c0-2b4fc2408855.json and https://artists.proofprofile.net/proofs/artist/ad2916cf-7e6b-4ba6-b5c0-2b4fc2408855.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 0x9ea19ce7bda7fc0fed15261fa9ebdd1c9a72f8568933b5c7f1d447577a5e3658. 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/FRZ086300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c1ad28e4c079b81f117cd17f290e6793ca2af8823cf55bf46a5bb293b880a6. 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/FRZ086500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce9a54ebaf605a420191394db68db29df79abb43a9ff1861fadaff085939140f. 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/FRZ086500073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959125f1b3026968483b6b72675f889257af72b1378e6c9d11144c99ec101c96. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRZ086500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8444ab3b8837362ff77ff2091bad06a62d31365e469d6ecaf806070432f95be. 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/FRZ086700133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55246b060490f846c50ca410bb4c050a53c2c70dac54cd80e0710f44366311dc. 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/FRZ086700135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f0598dbc7f69be7fd3b8193f9c43149b8404b88d9398046c26a97162a0eb50. 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/FRZ086700136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfae1d2670ee306104014d6ed5c2e3a21bf9789515e2679664020fd8563c3f30. 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/FRZ086700137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bf3271db9b0dfc44346ae4b1ebf72e72c1f2b995258b51a1a6e683c7e4c050. 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/FRZ086300058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab20ad462e49bef2251c1cb7a7a99504f3399a32b212156bb66dc001f160e1b8. 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/FRZ086500079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c8e327e1bc20bbc9783fa1cda5607920f308409b7381cbf7181fe01d77e2c2. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FRZ086400092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3862ccc1483c4f9a181aff3d6aa6d1314f78cda2705e2c6aa254060fcd0830ec. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ086500081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff9a153a2bbe16694bb1075370f3d37adeb89a1b38be28eeee6a230569c6948. 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/FRZ086500082.