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 0x864571b1d5fe1303be6da5503aa5b03eeb758aa8b1e990c94bc56fbb61c03866. 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/dfe58959-a5a6-44b6-84ae-f25a2e3708a5.json and https://artists.proofprofile.net/proofs/artist/dfe58959-a5a6-44b6-84ae-f25a2e3708a5.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 0xa9c91f9a003ef67956a45cf0c93b7ced06d5b25c8f7981df62125c2d08e8de4d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDFP1879419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219aeece53b3a8733662683eb5232b153f0fdcb69c54349942753f6de63d89d8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6Q2189541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219aeece53b3a8733662683eb5232b153f0fdcb69c54349942753f6de63d89d8. 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/QZK6Q2189541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99240bee091faf5942ac4dfa7e4308d8d11bcaf0be66502ec9cc33dd90318994. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/TCAGC2228226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629385be2e2e26777028021753643400e7876347d1009d594f3aaa6aac7ace69. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/CH6542239870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd78264853e5348719149d4c07ccb1f029e3ae3f4e62bc3a1b11934932c4eed5. Chain 2 (Bitcoin): anchored in block 958861 (2026-07-20T10:02:52Z), 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/CH6542267101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd78264853e5348719149d4c07ccb1f029e3ae3f4e62bc3a1b11934932c4eed5. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CH6542267101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22acbc95880579d8102e99f2dfb37ce46a7c015073efd552ec0ad09e6f6ade13. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/CH6542290256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85b1a6ef2863d8e13bfa53a607c5173876f9b43d302214a338ff8997fd1a4b2. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/CH6542310223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979a76090faa10e0bee2b7aea2ec7f458e945a507a17716088ac4d1cadb08764. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CH6542320069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979a76090faa10e0bee2b7aea2ec7f458e945a507a17716088ac4d1cadb08764. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH6542320069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5553a97986ceaed38fc24d7363dae97898de135a09355c7e2e68ef1c369f93c. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAHC2384883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9485abb04dcaff4e3940693d390803fd3f88d6c4174f08033f27b0991ff1946. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZW9K2304658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b74f3b1fb6e22efcc52be9446228f7ec569d88ae13c79625ea6a9c7ae85dd34. Chain 2 (Bitcoin): anchored in block 958668 (2026-07-19T05:16:11Z), 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/QZW9K2304659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a473353274a5ad52eef8a9914a07a808e1baf170d54776394946db78f952258. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZW9K2304660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9485abb04dcaff4e3940693d390803fd3f88d6c4174f08033f27b0991ff1946. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZW9K2304658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3d3791ba70674b06076f24d20f00181766ffb2f0e9885e68a8b9c0e1e1e941. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZW9K2304664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac6037666e800e76f97161fd67d5ced0187384a57c9611e85ff06835ec28429. 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/QZ5AB2462018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97db616015fef5b2f93e0dcbf402d2c1b89d880aebe061c3cd5eef8fc499944e. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZGLM2488925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97db616015fef5b2f93e0dcbf402d2c1b89d880aebe061c3cd5eef8fc499944e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZGLM2488925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eeacc28d03a4787a9ca8d2b049ce1d414058f1a2b3be2584ed7863dc417ba76. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZZ7L2463871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eeacc28d03a4787a9ca8d2b049ce1d414058f1a2b3be2584ed7863dc417ba76. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZZ7L2463871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a1c547bd1854cb1ee3c92933e786bb3c8609a0587d4ff6de3cf1c2b034836c0. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ES5062507801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b89b448074549819a1c35b6ffa7b77412627ac4d980101f802599097195455. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ES5062508801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f22c6a90227308ad886c057176930bb687abfcbf36f27c142871eb513a9c17c. 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/QZPLR2117958.