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 0xbb38dc3de7c0f7d4a0a25333825fe49e8384ec55875331a110c911901be6b97c. 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/ae72b757-4beb-442b-bd02-fe42838f6e65.json and https://artists.proofprofile.net/proofs/artist/ae72b757-4beb-442b-bd02-fe42838f6e65.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 0x8d020917220c13a8bee7ec5375b8bd809f9f2a40eb4eb27b78e8d3f63069ee0f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYW2020504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a36127cb35e06aecb99a9465f5dd4a6e82a8de92f6810e3b38de2543257e1e0. 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/QZFYW2020505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685413be598896b90caaba6284804225561e2c942a89b2c14baa8e9a9377f7fd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYW2020506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c751133be5bae79a28ed657cb811d6184c2d0f480b7915e73af016fba3189e. 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/QZFYW2020507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869688e6740daa29d5b4dc1ac9adbeda3a4cbe915e73e044e968c98c5b4763f9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYW2020508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd607cc494c9672caa846907f0138a567137aaec5e9c310c2abe5472725ca44. 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/QZFYW2020509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe341c7725a3c99d95ab13b11cce35d1f66cc5644f189273fac045a86328c7278. 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/QZFYW2020510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc5ed32523e5d8b57f29f100c361e6dc4e014626088bea6cc17e6aa90640a42. 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/QZNWY2425165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d8ec1b53f29b561d1523f92c9155a1eee8cff7bfe4a1ee6bdb8765aa9c46a3. 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/QZFZ62462052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407a30b122736de249527db319d4044f2d2d5cadb0cac3a359aca9412015caf2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNA2340860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54da7cfd64e5912e64a49f3301f232e14b726fe504a9fd3867be412f54273e4. 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/QZHNA2340861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4865082b748ca11e8c159dc272333e20f787bef6d1d56a455a3d640005bf494. 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/QZMEN2260528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe697d2b76677703941f0491839bb7f9cb0d2ddda69e94d4354d68e82e5dc83. 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/QZHNA2340862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4865082b748ca11e8c159dc272333e20f787bef6d1d56a455a3d640005bf494. 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/QZMEN2260528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef54da1fadc4dc53eec1425e6a7fdb31fcd0437fa57b90b9b6e538f0bb8a405. 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/QZK6J2148795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5a7ba5931f0c58f26c80637508182a324b21fb2198cf402fe4879243c81b80. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZK6J2148796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aad4b46514e87a5921583424cbeef8eabca023e8dc0f7fcb77947e6405c567a. 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/QZK6J2148797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d39ebedf21bc604c14f8b75d332d35b9c95d8d3823d6376e629b2a29421baba. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:55:43Z), 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/QZES81822372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1169f9b6ba40893af5f9f96d9c07082f97660f8a6315b4dad53be7b33ec574. 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/QZK6G2543984.