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 0x759779e1cd26295e2c3e06041ba9609f6ddc653e89165fe75ebdf600871ad30a. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e62354b2-bddb-454f-9604-cb841ae1f6ff.json and https://artists.proofprofile.net/proofs/artist/e62354b2-bddb-454f-9604-cb841ae1f6ff.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 0x73c607866dabc150efd7f976295ddee5d63c51c29faca98d5ae4052b7cbf2751. 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/GBKQU2453237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3d84649fc3e790286ca66862076a744fe2882f3db3b647dc53768efe0e8616. 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/CA5KR2382160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0127b3eabfd08b69124c8e4f8e2fb0a518748ffd233fb8671ac0e9225446b6. 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/CA5KR2382161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404373e58896b0ce0990790d983c198debf4cb7f3f43ee16874fba90c4d69138. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GB8KE2324036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573f6b8ef38cffe2bb669cf84a90936d32205c12913c7df23d98cdc8c37ccf07. 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/QM8DG2325892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa586d76ab168645532920733b0b1a4f7933105ead886ba40ab836aec2f322c1b. 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/QZ5FN2358683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e3f290e8505da0ffc6a6985397a0791378c2aec0e329ba11b75419a013289a. 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/QZ5FN2358684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905942ca19333b030e52121826191df450fd5e547399a998940a221d820b0d3b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEAR42345176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8175ee73d9003cd50d66035fefdc7534a295379efd25d71e2c5282dd3b0c59a7. 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/NLCK42225427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb2b4c08148d22e87c072791004abb98a0424f8a8bb9de5309108535e273439. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLCK42225428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15df59530b6d640b3a4da5a659e7209c6e823ea1aabc5401b36603856428669. 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/NLCK42225429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426b70c99159f12e9967001069381c30936ac5d035edb0a7f56bc1d894f908d4. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLCK42225430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f983b136152fb637fe884e76646e4dbeb1159c7965c5d0583fd7523a22d8461. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBKQU2278144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82981cba83c893f86b94200b9b46186c15d54d5ea370dcb251f8ef91b1a125c4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCK42215062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e95bb514cb08a6ce01a24b8ab389afaed39437dc1d10de6dd5e932e224c7517. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/NLCK42215063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f73e00396303632d11db79940e8631ea11775d16cb42233685cdd2c7215538. 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/NLCK42215064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf35202da79b8adb048516caead4bbd2497268ffa06dcedb32394ee9a36fb97d. 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/FRX202287095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685ff88775c6035feb56c7f3bcc64b2cea89d53205fa4184471816f9cccc091f. 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/NLCK42210994.