thumb|A midsummer bonfire in Seurasaari, Helsinki, Finland thumb|On the beaches of Duindorp (pictured) and Scheveningen, both part of The Hague, teams annually compete to build the world's largest bon
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 0x3f679ab7dae19db3cb9d7a5f3cace1adb44fca4fa3fc57ac68a0259030f81d23. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8692fb4f-c3dd-4b19-91b2-203d0befb23a.json and https://artists.proofprofile.net/proofs/artist/8692fb4f-c3dd-4b19-91b2-203d0befb23a.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 0xbd8eab71ef1e6fc0014c23cd8486903d0f2f5ba0eb3e1afa77ef069756250927. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/GX3Q92562403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecb5e3c2ba48658a87b537b079eec4fee8660ddbf8f9adb65d7ceb9483af3c1. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/GX3Q92562404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1601877a1be190ba2c5ca4baba2c04d2ce0e5da04de5a0e389cfafa358b3394d. 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/GX3Q92562405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e0cc21d8c68b483c1da13df1747eb8fc27689ea205202a7544dfc2a54be74d. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/GX3Q92562406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7553af6296dc326be74413df5c74aceda76495092ef44bafe3d7c319356ffb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GX3Q92562407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5aca0b544527c1197799fe42db913eaa39c92d5f462d602cbd21db1fd7a4bd. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/GX3Q92562408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9b5a94ab9fa6ca77fe0d3eb5fb55b6df5d36df9a51e0635eb6800146b6f069. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/GX3Q92562410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414e48f4bd4c3e4a0c38b3a6476fa73e8a12ee4e92397f820dc5c821e0b0a606. 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/GX3Q92562411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1c261896e02428f7382fea663ea544f52e7935bab2532c30ec120fdd722ce0. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/GX3Q92562414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c0f6235350034432f4c7df2a4de4b608f7a736f5a6423b1ef9d4ecd86ab4d8f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GX3Q92562417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75c5579751fb84e305a58458d2c83e5ac52914cd5cdc63aaaa9971b2f68ee82. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/GX3Q92562420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119e3c94fb4045f76aed2ec03f00ad21206e2c52dabc9cf7a7b033010f46ea7b. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/GX3Q92562422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa947a67e377d98c3d3d103a3d5c6c566c9c6cbbbb2e2dee7c9852e9fde8f2c2e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GX3Q92562423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652cdc00285c14d0345d227e09eb8ee07f1cbb7d2b6c047fb82e0b5eb8c6c3f9. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/GX3Q92562426.