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 0x44b008b6a6dd885b6d54f2588f729eae5edb7f3edc01ba2eb69daecbf3ce5699. 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/cdc5373a-4f81-441c-af7f-eac3f1bca520.json and https://artists.proofprofile.net/proofs/artist/cdc5373a-4f81-441c-af7f-eac3f1bca520.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 0x8e459472290c661ec1cc53f9796f0909d9719e7feaf8f81dc2ffc24b48c7e927. 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/NLRD52416695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966919f21b538046a3a0daa4067d2acf44d891349328abea97db074ae47fc9be. 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/NLRD52303982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1a6880f17074376f94e91f99e314d3b29d6becacbc35976319aaa72f3cea22. 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/NLRD52119505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4debb3983b747912e6212fdc1504dc57536f640a0e519bdb32d754e5411d0cf0. 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/CH7812103558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52620b66bc96fced0f77a081b527f813b32032c2c7149f53c6cfe518f7b48515. 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/CH7812103559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21518be342dfe71996fbef5a77ddf443d6db77ebdbfff50007f14531764a0e3b. 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/CH7812103560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592a74fc520572cab72523c008f27a81cb9bae5fc0bf157b4198e4b0a05cf8fa. 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/DEGA22103434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87d81849d71ecefbed14c7f6b8701bd89ff761123542cdf789f0827d8b215eb. 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/CH7812195263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2dcd24e2ec7867572359ed6d475d212a7c1d843fcea769fa71169f58aafba6a. 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/CH7812195257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143cd4ff5d1c0999d0732cbc00bb677f7d761242d85a5127dce3cc78ab3bcc0c. 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/NLRD52304327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce5a71352406b9af731821dde60ee86bcadf25311db32bfe2fc1c82b99d057b. 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/NLRD52304008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaeb9c0639a6e7cd5c48c7cb72b9101666e8da0f93399a4cba7fd2f08ca67077a. 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/GBKQU2369014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4ade1fdf62b95ad98174985199f6a3da60ccb64cddcedacf571f93862f63d1. 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/NLRD52332926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932c478778810816933b4ed5df1dfac568de415c8fbed62dcc36e2583e6195eb. 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/NLRD52304358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e77440dc7b3fa21589c9c53bdd181e6d34c09d4733624bab2073664c9c8b16. 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/NLRD52119544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ef6a82b4b3b78916d26e04e64cf2bc2ec4fdda2f3128a27531c3617d2a8af9f. 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/FR2X42262118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fd70c55b2b18690315daf46d23797c80dcc3686c6de6e9103ea884667f2f77. 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/GBKQU2083914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9725c8a23205b774671678edf82f4b636553f89b8b5b90402536f1fc8aac6bc3. 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/NL1AP1940540.