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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa038b3bf44bcd01ea10cd288ace4e4b5ef61a8b9a3055c726e210b43999b4c6c. 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/c1ab3887-9f0c-4536-b28d-ea3942a6fe44.json and https://artists.proofprofile.net/proofs/artist/c1ab3887-9f0c-4536-b28d-ea3942a6fe44.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdaf10d128371c8f438eb8feebf19610cf81c6622fd3fda6aa6158494a66c4e. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T11:00:12Z), 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/GBSMU1858601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445727740e45d6126d075d0acd3891917a31e5d6b1fdb4b0c835f8b235febecc. 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/GBSMU3281905.
Only You (feat. Elisabet Drosdal & Kevin Hayden)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233f61717973efac507c5760a4ea36e73eee49af6ea7b6a76208d4a2106c9c5d. 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/GBSMU4106439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cec64f00668d9e0b319ae895be1a2e03a59d0a0bf7fea615406d168f38a22a. 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/GBSMU3391390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd305a5a398bf9da91f779009e8f05efd5ffa09e8fbef87c74c8676781b48f9. 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/TCAEO1911075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524be2d6f9fe2e702f386ddbba101bb3978416fb9c8a213475423bbd2f452d86. 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/TCAEU2044796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a6dfd6b9b46e994dff130aef6506a7cc671345de1bb9a65acd3698d9bb2821. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAEW2022027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64ee0681f13ddc201a084bf085b79b8ee162ffcb01d603964db5ad29c1c8b47. 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/TCAFB2001166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1a84abc5a0ad454fa9a8cf20ae4e89ee2567bfc2832c4b3c3080d3ed06507d. 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/TCAFE2033410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7d5577c86169f79b0bed12124a1640c183eb566f2d7f65a3363030ff658323. 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/TCAGE2238937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeedfd168dac9932f78b6b1c81a9b39e2da4514e93929cf36a1ee36201071273c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCAHJ2338534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc556ec5b72e9b70acf368a95d43ed297ac2e18c9e352d24c4d6489d7ce437d4e. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAIN2460809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177a60fdfedc454c831c92e831e6d0daca5d004b112c9b0023e8953d391436f2. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T23:40:41Z), 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/GX3HH2587252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afc6aff1762f41ff32a91d8057a326b824f01bcca853132e487863bb545eaa1. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/GXF972580139.