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 0x3f0d544fa45f534b5b020c1c01aea252bc93af1ce5f3288e73a8dce5ff86a1b8. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d288ed40-eff6-4dbf-8c90-46d0a19f8b2b.json and https://artists.proofprofile.net/proofs/artist/d288ed40-eff6-4dbf-8c90-46d0a19f8b2b.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 0xe4f5688c79e7c9fc09db97d2852624df91514b254248d0624befe67b5bc2b57e. 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/GX4R52366005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72fc12f1209c29ff7e54ddc2bfd99da3c409a2a19abf2ef764d72e284f9886b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GX5MY2128499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1925df5a11ae40451fdda76abef08b4f9620ef455cf1b2a018a0f1ea0e4adb5. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GX5MY2128500.
Boundless (From A Velocity Original: Our Summer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04e37641ea1e821de49e5c1bed04fb26ddf785bfb739d836a9645553e266138. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GX5MY2232740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623d43d54e60160d1077bdec24976040502a55eedce84e02c0f3fd48f4ddce67. 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/GX4R52226471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf6d07734f99035d77dce78ea4882d39b87263d2306022d7e440db218f375c3. 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/GX4R52226620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e582da1f9d67ea632afd9a65906071dd3f73d622f2f9f46f574639a1826029. 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/GX4R52226621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4900f0a8933448ecb944a0b906dd35d405d5e8b820eebb6c810c7eaba0508870. 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/GX4R52226626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2736f300630fe5b1a0405a6af9b9886d5b4c8292a646f7e31f56b7acb6207516. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZMHN2296681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331d7c56491655814752bdb6b88987f0b8fee4aae2c99e1f1b979f8632e83a48. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZS662204753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36798caa3413e7b2268ab8e4bc74837e46fbc287c43c2fffc3a7998797e4e154. 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/QZMHM2248254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d91bf9f139abe862871f38260062e288323d6294b1c3b49f87075df713fb121. 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/QZS642211649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5527f04a24dedb0f36099e04d101635860b8097d9aa0029e5b95ad486cac09bd. 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/QZS632242395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f8264841d6cbac8d444f89d7022a950bd3f8b1cbb67c996a71871f8323b65ff. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZS632293805.