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 0xd134198435134c67a5b0a0b5514de3952c7cb36a57cca8c3a4721b969ea3adb8. 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/5845a0aa-1308-4061-b6c4-74c01905d49c.json and https://artists.proofprofile.net/proofs/artist/5845a0aa-1308-4061-b6c4-74c01905d49c.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 0x85e60b1dc381b0a5ac7a7dea96f814033059b3ee83761f413ed8f0512a911476. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/GBKQU2386714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9117d6ae4ba19287fcf1aefc0bed24dae1dde601d965dd45f52a18983fb2ffd. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/GBLV62417884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebd952cd096a108ce7cdf7d243389a91b7e659c11888537fca3e19228db907c. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/GBKQU2516880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc413f7107efc64547b8cf25021fbe9c6b65d272b3af61050cefb641037128c66. 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/US39N2300973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d668b67f423f4d311f6e8c407aa4a2a418b12a99ac4f26451849dbf1f55f27. 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/GBLFP2235760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6443a2c75212e10342c606ca2be1706a4458abd233dc7a9da1befa49035f8d. 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/GBLFP2235761.
Pre​-​Rolled Joints, Vol. 4: 100% Garage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7df5de8b1e8ff12f5e7315510cf2d18850a7b9cdd17449299ea5280bc2f848. 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/UK34N1800674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7df5de8b1e8ff12f5e7315510cf2d18850a7b9cdd17449299ea5280bc2f848. 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/UK34N1800674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11f56a9f062ec03a00fd300d65b275f8cb23725fea19c4e714b050bd656107e1. 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/UK34N1800675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81001666c4dc68356382566f7c921921176a7d0a3795b727f8dd4bb5271a6873. 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/UKN6K2100164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92dce49ca870aff4137eb55714e2d784f73c70b46ed47e6a9c0cee8b0e9f266. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/UKN6K2100165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869dac3beb3d90410299e2a71bfb6870ee75cb3c694870b237ca45e1e27f6aea. 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/UKN6K2100166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92dce49ca870aff4137eb55714e2d784f73c70b46ed47e6a9c0cee8b0e9f266. 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/UKN6K2100165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81001666c4dc68356382566f7c921921176a7d0a3795b727f8dd4bb5271a6873. 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/UKN6K2100164.