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 0x7d2a76cefe02a274b5b4a3914d2c610b8cd256ab2c3dd91f6197e1b84b2c251e. 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/50541d84-97ed-4db8-af9b-28b762b88d37.json and https://artists.proofprofile.net/proofs/artist/50541d84-97ed-4db8-af9b-28b762b88d37.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 0xa5a67c2f06b50bfc564365ad2399cedde0ba9f8ef3596abafe5f35ace32b4133. 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/US3DF2425222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5882eda63696f4033fc076a9edfe08b913b199dfd3931c0c45001e93c9f50c82. 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/US3DF2425195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x534b4ceb4ad25ae88bb8634bb51e3fe0e427127e2c9ba07b5ff9774e66880a48. 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/QM3DF2203383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b85b4195e91089ff22b617822bb834ce50ac13d0036eb4245ecbe8693eba15. 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/US3DF2436206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d133d433a822bb219903abd256c846d7f15e1fdb95d256f0d899fdf85f719c. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/US3DF2436815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db1c8bdb6e05540fa3238258b675e663ae91d947f363ea5249102e783bcecd3. 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/US3DF2436820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ecc31e5e2916e68d589a48d9233472192929b02d1ae0a4b268af64a1ca36a9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QM3DF2203498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0525e05060411c6f598595c312525dcb8671e08c446db9041d344e620b9fd6d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM3DF2201039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a13ba8a5eff4c4ac30b82245c52e45862314f9d648c06f0185d9cad7cc9835. 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/QM3DF2255569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f689dc260ff47b562a8fffa2cbd2336d336521f6be1c8193f8e6a89357b8ed1. 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/US3DF2425212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee599ce3e91deb01090b361c7986899286e1b704a4f2006a9428fea2ae6ce9d9. 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/QM3DF2278320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5882eda63696f4033fc076a9edfe08b913b199dfd3931c0c45001e93c9f50c82. 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/US3DF2425195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6297065248955683807eaae8833f1353f89fac64319c0bd5aefa196ce3462d69. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US3DF2425196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f40bc676b8084e1087a83ab82a559e193ab799609c97f971f5c44ba08dee047. 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/US3DF2425197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55be0af613d5fa728ef746b44b4e59758aea899c6fa914424cf37cec753f4f44. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US3DF2425199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2fa88bee5282f5615e3d5fa71a269cc5fa538ec1edbd7970be03bbe949b946. 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/US3DF2425200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4993eaa5a57ef362f26807c1261b461bbebe8e95c1dbf4e92a66157a2aab2c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US3DF2425201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314faea9a4e7986da32f94e452141291ebd92be718243c7c799116e79107ddb6. 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/US3DF2425202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e1111ed9f3e7733567d1a14f3dfe8c6a603d6336d513e722969be9681ec19b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US3DF2425203.