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 0xf004339042f3442b477437eb737b5b8d0c13a95c5849918e73c8dc9ff93def89. 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/a10d3a96-8c64-4e3a-8ed2-20692b6e5f98.json and https://artists.proofprofile.net/proofs/artist/a10d3a96-8c64-4e3a-8ed2-20692b6e5f98.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 0xdba05226a24edba69ecbb3a50231c5118915a244782f8c267ad4287d9dc9edf4. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKG732434453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983d07b3920c1cc3c77a7a5e58ab175d03258f395225bc3fa0b2a5c633ab6b63. 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/HKG732428496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a90e7b6de0eb4cdaf71f3442a5dbf6381744b555081caae578af9f6e48f0ef. 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/HKC992424080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f6c8dd3086299e78220bb6c11b94cb55ec237b25ea2f328d0cba091655ad9d. 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/HKG732404297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164228efadd68c70200401808a0085a14c26782e1ef28d4eeed0a8db578fd102. 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/HKG732404295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x430dee123c804e1c3b308dcc124b79b0ae6237c68f99bb7aead7a9cbb8fbb098. 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/HKG732404296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8df3f63b80ac0b8617e5bbbb459462491ceb78b4c4256dffea4f1e1253c093. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKC992325691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc697a60598efa5649aac7d0c3ed9e82b9609f0265dc284fd0251186ad0f7c6. 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/QZYHM2355123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53843cff1a18872b694ce5d684d95a29a74dd49dde28300561e44f36d95c385. 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/HKC992325098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6a3d2c7605d8c87ed23e5cbfb6f48024f694d0e74a4219efbd99e62728ac06. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKC992324998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1d144d88f45f810cab3d592581f7dbc27733f7278453321d8e19d6e03b5b55. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/HKG732305313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa764175bdb30ef7a83588e858fc510a8be8ef0ca9459a591b27e694f0ac242bc. 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/HKG732256168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16107b8b7d8a37e1f316f35f0352dd127909838633c73fef36540dca99dc795. 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/HKG732255822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b97d375f966db5ef92102edcd6fc6058392833e470b1ef653b2f879a0e267ce. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKG732255963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc80f0a7f14d5a82d23abb722fde4dc5f0fc113ecf56f4274f08e0fe00cf1c9. 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/HKG731794700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf41b018fb72408666a0f21c3c41073c72845a89bc7937e39dd25577ff87917a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG731775316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88deee4652185cc770991b82873ae6a63204ce5eec8628e76e0b8ecbbc56bcba. 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/HKG731787739.