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 0x23f7905a5244415c8b6b5d8f2f97e13280647ef4d6a0de58077bfebe2fe48162. 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/18605ebf-a52f-4d75-b73c-62562a2ac66a.json and https://artists.proofprofile.net/proofs/artist/18605ebf-a52f-4d75-b73c-62562a2ac66a.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 0x810a0efd6906f173bfadbeb733f5e3cfd2dfa822155b35b8e112774b7e804bb3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SE5IB2343411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a858eee59071f44f01dd0a2835ca1f8dd7dbaecb47a829741c2b5ae68f3b542. 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/SE5IB2343407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f0103ea9d21ac21ba73dc09299d924a83371d7632f26bb4feedd88c00d4271. 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/SE5IB2343403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593b01a838ac260f909babfb737b4a20fbf6d9a3e67eab57b238f54f2738b62e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SE5IB2343399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7567a8c366a05893d2fc18b7bf624f99c6c80ce6ff510fd79b006d4526aac50b. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SE6YL2300115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697b67ffaf73a2e7740d7d8d262e0e0bd6b40b6746b67f2e0b9e4ae13591893f. 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/SE5IB2312163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff8f46c1fd5a54389b514bf6db1b4878cb6be99dcbf7078cc7b4467c69e45ca. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/SE6YL2300114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf8a453d02f4f00a7f8d469663e24a7e4da69edfbedbe47a6c8aea4b522ab09. 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/SE5IB2312151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaac906924f4dc8fb1fd36f33028fb77a75ea598d7be4379c54ad49699ab99eb. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/SE6YL2200610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2417c708475438d6513385f128ce7c280b5e111e93f648adba72bf0427f18be8. 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/SE5IB2299438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7030d7043d2027433cd2b15650a56189321929dce2cb7c7dbe087d456cc6384. 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/SE5IB2299437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012887664e5fb44da2f639ab8c33cdf5a712cfc5a000278f876ac10913a5d641. 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/SE5IB2299436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0adb04dfc807adc4ae580308f20dbff75238bf9002f26ea2587f0f160c385e. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/SE5IB2299435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcd9daba130627e6943288fead696224bc1d740e49c35d765115ca9fe703a13. 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/SE5IB2290561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2e05049a14b800962b9a1eb524e8d85884bd86d33b517a6b42f5dde85c2f35. 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/SE5IB2290545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb65443b03fae0e59cb6cee60b00cc25f6e4bc8e01fb3128db849c8c07c57f4. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/SE5IB2274801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bf85ebb540ebe94b28ad5d8b037a88d9ed4619c14a7e274ec33e8421885c77. 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/SE5IB2274785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b3f616454713a6865f4fe29cd07a4cd51df0960e3e16c05d545edb43355979. 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/SE5IB2159491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd3a520d6a3889170a6f38737978e8ace0b924a08969843f303c0af29787dbf. 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/SE5IB2159482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5369b29e4f678128889755b593260e15cf795af88f565a142101efee3923d24. 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/SE5IB2159473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5569916a2726ce1867686bb936965556677aac9297eec06713c315f4df11ff19. 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/NLT2H2100313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbab841fa0385e049ed5c5d5bb2e4e826884139b1b392255289ccbbf773d950d. 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/NLT2H2100314.