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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddb67e34fb4a845db0cb9f446fc08bc908c0012c76dac6a77d3d7dc2720afb5. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4fcad97-2bad-4946-8c51-3a185a4f275f.json and https://artists.proofprofile.net/proofs/artist/d4fcad97-2bad-4946-8c51-3a185a4f275f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nearby Distances (feat. Mete Erker & Anton Goudsmit)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bab623c7210da9d6d72e271263a977bc7aa4df2143398f33e8b64515d96028. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R2500750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c89e4e75715b54acfb2e2f5184e169ae3efd097c9de00f3013ba4439099af71. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R2500751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d29d02e85f773b6252faee4c5a9e58d6fc411a622a4895c689cc09657db18f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R2500752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cdb61b1ade506c178169009cdbb9c05c1df870715011706106f904c6ed2c0b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R2500753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8c306a5df13762bf465256574eebae8818a5bca3ad6d79686298481dc6eec8. 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/NLL6R2500754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072b360877b131f35bbb8ce7442ce3bb0906f556d304e3c19c8830b962d3d4ad. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLL6R2500756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fe51389c6f1ee514fca004e9984c06d7a94ebddbe2e23d51c19197ef85ddec. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLL6R2500757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5459af10305526ea008c347bddb28f654934ebdfcf5dc4b85e9eae293cc0e2e2. 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/NLL6R2500758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748da0f02b71281b1e1ccbd7ddf0b1a5c138413101e8087162ef32ed0749ce38. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLL6R2500760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384e14ad3d89e8778b9cbb407bc42f2f268b4458e45efc5937ca90c8055c9b52. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLH212400192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6272e8760defd0608a8db49111ab4abc6c7ca9c9fcb8b927805741abd64533. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLH212400193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9c7eca121ecb938ca7e8012d3aff55512a535e1fa9694e41b83a3f6427982c. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLH212400194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf9bdc933e6f43a010ffdcaf9be35d8111017206c8f57cf5d99a45a61f26ec5. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLH212400195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a08154f2fd6ed07c40a36ae828f1fc0f92085add19fe941179f141979dbace2. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/NLH212400196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76da4bb7ef4c536512f906e27f54e496eb0eb107e827974b087559dd86500601. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLH212400199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x243144db5e6e5236f696dd00146437642042dca5972df998456ce45f93c97b7e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLH212400200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc633c4ce2705be5e8a2f2ee206aba0bdcb08dd8464d5bbae16225acca5b2bee2. 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/NLH212400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x486b324c9b1de8693fcacdc1f5d3397b24b4e1bcff9ba9115d0be160e18b8b6a. 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/NLN912400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af1a7b8b329ec72961004df06454da8189cef430e68cb93ba337a91695ece5f. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QM6N22350669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b6272e8760defd0608a8db49111ab4abc6c7ca9c9fcb8b927805741abd64533. 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/NLH212400193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65fcf05670cfeaa8315c852330b8304c193a003f8cd370ca19967247332fa41. 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/NLH212400204.
Paul Van Kemenade Quintet: A Night in Indonesia