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 0x6239d1799de6cd22ce3ee638b1837760ba9bbb86038743d4b1d326317a529e72. 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/d8569e15-f27a-4817-adc1-10ae156bf7dc.json and https://artists.proofprofile.net/proofs/artist/d8569e15-f27a-4817-adc1-10ae156bf7dc.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 0xd78394c466327586b5e661d9821f6f2acd3d72769186a51fbb60ae3e2be3aa07. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZHN52069701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989982c68df167f44b143cf4dd56b678a083f81c73bb1366e2b670227b7f2b1f. 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/QZK6P2275692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3a4d30b2297bbba0dee2b30e9c4a25623eaafbb144d405f67693e986e16f79. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZFYZ2365424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d1e82125d714ca5aac574c4c02ddf402245e49349d8bab7832aef346f465fbf. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZFYZ2365425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b5a162d2075d76c0d9761ce65d795017fa5b3d8e7c72f5c203dad474d4fb38. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/QZFYZ2365426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a921c1aab57e89219edb6a1be77c7c98e2917ea4108a38d0afd8e0585ac41c. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZFZ22308410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d42f0bb64f78161757f2a186ff7687fb38ddf408a22f91e08deab45986e99c3. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZDA82347567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdedd6e48dff978eb42feb0f8645cb8c1e32d3ca725746e1f1e7a750e996ca82. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6N2328339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d404ca6c4af0b7a20e99c34e29c879850dc02583e7ddd1946d1c3092cf5420. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZMER2314861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ceddb062cc1c28aa3cab5ef924415425512f45c4b1e410190014a94cc1e2b1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWT2353246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ceefe8f0e1ddfb8a7e43dd7a545b21a9f6074d34c15ecd5f2230bf5f5c03a1a. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZTB52372220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec12fba20a39a53b92e2d4b73025e0234d08240a3d0a1dbe2fea2aff8a564bd3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFL2383989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726fd3811fd9772452ce2bab8a70063cbbdb5956d221404e5de88ab94ae5c0a0. 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/QZDA42476002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f0160a46823848604d481a3d43761007bf4c26f423e53e00910ee0fbdeeb15. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZDA62483762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0ee7b78a1eef04ce9870961a8ffeb05504c967099d4f792fabd8c045355635. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN52403275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfed7b950ac99c9f38a26d5c2bdbfb623776a527e71832f1b86387af385992a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZK6F2421465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b10d7d8d6875bb3111382fb18086d29216af21924c86ff16fdc8b44429b2c17. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZNWY2435692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed418f233004f64d76412fd927cb9dde7c43c1a9eaf0186eb36461daf2d40042. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZZ792480218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62fc598dd7eda323c6a3c475a8d0ed55a2019d7d5eafa87e26e5e20492452a7. 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/QZZ7R2427196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11602989af518ca2d5673f0820f5472368b3ac8314ae6cb644a2e1c1932c2925. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/QZTAY2592287.