alt=|300px|thumb|Aerial view of old Jaffa 300px|thumb|Aerial view of old Jaffa and port with Tel Aviv behind Jaffa (, ; , ), also called Japho, Joppa or Joppe in English, is an ancient Levantine port
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 0x8ef987927c903f6159e5ba9ae63e59e319a79d1e61ca8d027b3950c53ac93602. 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/ea25d70d-2cec-4c34-92d1-c0ad1c88d26f.json and https://artists.proofprofile.net/proofs/artist/ea25d70d-2cec-4c34-92d1-c0ad1c88d26f.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 0xacfb42035aad182cfaa5d773db1d7ac618b53b38666db5ed4d4ee2af2f08af78. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USTC80905464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0fa6483c124af608f8d2f7bea1ea58ada2e4d89ae35daacaf5a4116867763f. 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/USTC80905524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ac85728b48f12ac7215806038306216cc98ce915d6f40a59f27bd6792d0858. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USTC80905563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5afd963061efc49178fee62239664a01c41def741ac5a38af6fe265eba3db9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USTC80905578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28bb83eec1abd1526e9e67799cb912d145c0e1f84a0a9f451fd9e63d15fc865b. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/USTC80905710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc451ee6a7d91b2c047147cb4d0d93c22c1a4a40ec10521ab484376520e053fba. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USTC80905794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325368c99b3040d509ddfcd05069a370d5525f2ac84596f1c7765d73da38a816. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USTC80905802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc8fa3a2bbd0ed1620fc341b7dd59a3664d634b7c23aa03eeb5d5a38891a36a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USTC80906659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc5cbe386188f295549271da14aeaddfd02278fb4f6fdcf236533fc3cacd129. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USTC80906660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed1cd9aaba012e4ebeb2d67b0163456428a956d8d8ee4fb0fb185a097315f67. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USTC80906769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f6fd1da1cc6fd2858eaf70f192e196ba3893df28415f2df8f57b0d31ad36ee. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USTC80906724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3cb457eb5cbf60e6da0f6b465ce1eff897077e62990d76c119d1a695dac157. 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/USTC80906745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c5bd89316ea31c6e7ee0553ac03bdaac697b95bb066821d2925d22307397f7. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USTC90950327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5caa661d811929e1315d721186affa907b06b3405551429d16c161164f6d722. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USTC90950639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf6a1af0c8854a84d7954d4c578efed5d9a5302593cfdd82b347706b04e36f0. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/SEYOK1726091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77371ea6edc3409940b1177200ccbc34f5ae4b0f0ffe2b849952a0bcbb004907. 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/SEYOK1726092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5e4b4111a7db6cf6682e8ece14eb8ed1713ba22c9b27eaf38153763f95ad36. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEYOK1726093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8bd7d2f4020626846cba5f4230c084c7d1ad0f5e890a59c751a747d725c21c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEYOK1726094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0422207ae83aed8677b5a14c8339ab067a2dd5b91a9906341606c68296c84761. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SEYOK1726095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c233924932cc8e05ecec9737b3ac9367537ded6520ab201ca576f410aaede17. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/SEYOK1726096.