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 0x9c42e5778f87a11fa99fb7afcfb73c064d8d458b6c1aebbb50f92003f70b7764. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d653425-a084-4665-848c-3ab472a22737.json and https://artists.proofprofile.net/proofs/artist/5d653425-a084-4665-848c-3ab472a22737.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 0x7704db7fa51953d1c278ff3f265eaa4e918e288aa3d14223c029c5f5ee9b286f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QMFME2347305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7620c0c99bfaf95715c0266bbd4bfad6ce168b09a3bdb4a919a527e974a223. 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/CH6541959500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff15c483a2ed7999df7ebf674cb9b7f7e5552feeb394ffec82740b876166a3a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CH6542018058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cecf6da7f8d7109543f31c3db4885410f791342154e9a4fe6af19453eac65d. 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/ESA011801120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1965dc71fc62a7749652560d0501568b131fbe9d41430dad84be3147d97e98e5. 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/ESA011801121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f6cf9c34aeb69fbba049fac3ac91c4c113c9341642c479c2fa49ac6aafae5b0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ESA011801123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32756c13dc1fcd3225b365f2e846c9ffa9744896d9d3c0bbe25b7d47a24c038. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ESA011801124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e2f4b49a27558f427008ba60fb9816c2b34402ba00787423b5dd74200eb97f. 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/ESA011801129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443a1d0f4c054d54ec5470ce65eaad436df1dbe83fdb593ccad2abc799108238. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ESA011801133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65a3c19e07bd5a209c7692c59ff9501150662d9bed1a65cb52fb5d69b79b43e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QMDA62424291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2adf0fddc2c624bc44dc2461505e862e22ac70047d2a096fa5b5427fc2d7757. 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/QM6N22465992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3bb031f77e7d32c290dc63dcef0ea32c4a14bcd398ae29e0a2c09ffcc12158. 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/QM4TW2463321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbae460fc10ea731fe834e62133c8f9eb2771e54b44a6633bd8509b3a100d146. 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/QMFMG2361119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87120b53769446a4aa4baf8ba1f1163db43d5d887de6203c2d05a3a3b391381. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QM6P42358951.