Halloween is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Hallows' Day. It is at the beginning of the observance of Allhallowtide, the time in
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 0xe1d2f16e20125139697505f684796d324479dceeb19d5223b8150206801ecc07. 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/c0fbefa3-773f-4bbf-91c4-c8e4ff61a511.json and https://artists.proofprofile.net/proofs/artist/c0fbefa3-773f-4bbf-91c4-c8e4ff61a511.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 0x9238d24be07f93281fb247370f0ef45f21b316040a66122f0130a745b981ced2. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USA371448013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c794038323e807cbb1ed2a8dfe95d1be6096994bc1c310e18f72225872a17a2. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA371448014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2a9ab9af4472cd8120a54be2c323953f3ff8465e130f121b3bc20b72ae8074. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/USA371448015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bea8f0bfb0777df303dfadc940646a6f3754eec18f5cf70141de6256e3fa092. 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/USA371448016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f10386824e4f0b61c7c36f508d5ac95d133517c2e6e384334bbf1e1919fca8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USA371448018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28baf5781f9fe3fd4f4faa9148d22e1411dd9c95e1bc8b5b5a43d1bb82241df. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/USA371448019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbcfbf4e11438f214327ee3efda946e766d5ef0d511a5099846236c4f3e96963. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USA371448020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3004879ffc51895b442ca28be02e6fc7bdb6cc7d1e12144ff646dcb9dca6ef. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA371448022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5134ca69145bef6c462d1d335faac39feb51e1ff37b4430b35e0da6fde5caafa. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/USA371448024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340e0395a3f379b2f705cd0d656586e5cfb275ad581cc1fd9163d701448b34f1. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/USA371448025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c86ff8e61950d24d58e9b26d1ccf7a747382acadf55b426bf8b9d2e1ee501d4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QMBZ91663967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1b960b44f9e1ab457ed01ecf96c14968c768f9e0e6d5aa1384d0bae263faf2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QT2VB2445016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4e8370e4f22e86e0565d77968be0656ace73fbcc68d3d2cdcfc920f93e4decc. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QT2VB2445017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb069ca6af7ed847f61648ab2f75d36e4cca71fd2814eac4fd64515b8d96806f1. 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/QT2VB2445020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471532f5102a9fb411db23bec07d539f26d0d34319fa5db8f3d04f40ae8628a8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT2VB2476531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8a3a32fda335a05074e26580d2cb8573a8d17080c242f29a385ee3ab09bf1a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QT2VB2476534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334cbc19f94fdda45d9534ef729f822bd8e3e856bd75301ab35ed62a9c4b22d9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT2VB2476536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4a4953810328c6a5ea11017a20db8d53705eab493481592a06d360d7205141. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QT2VB2476537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8056507069e07517eea84a6cdd081dc6fb72afe5940d8c897abebb5f160b7b4e. 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/PT4CA1434090.