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 0x0ab10468edf587cc36ddbdd92d14cb6487a35aeff4e7b19fb2759e22e6a0f0c4. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c578c722-3554-4464-a955-58f18ee8e883.json and https://artists.proofprofile.net/proofs/artist/c578c722-3554-4464-a955-58f18ee8e883.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 0xe750e1f387671a21833653e196309061f1652198d7d3c3bb43faae257d12302e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZFYZ2159942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9824f495e023a0d0d5715f07dc6a3cc5d9b6ea1d16e46b378b2abe3db9e9550c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZK6M2008809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99aa1df465b46e0cac4f52326080308eb91f2560d7ada2f77701a92951edc48e. 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/QZHNC2012996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0826ce6c5bdc75f8d3be97c7b53075b32a8f46353df835bc6af196380b3267c. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZDA52096056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a465654c4149dfab0cc0d96236219a1caafefd9c88d107fa753a15c5448275. 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/QZHNC2546720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec72cf7f81b9957336cc752a6a6ad92ef3cbea5d696e0d2deb51e241913d4a8. 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/QZHNC2546721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd9192e82fefd3dc7e2df4cc115568653654959820e7f6b1abcaeabf92b3dbf. 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/QZHNC2546722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbcf8bd00b490358df0cbd2bc77b6fc6ed15946ca5d9426210da6e9025232c6. 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/QZHNC2546723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d16a0922d7448a0e7757c929cdd4828cc2f52e904cea784a7752787ab6aaab. 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/QZHNC2546724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3abb564ad881a2d2b120979a465dd3e2bb06203ba7269e01c0f28a0a94fdcd. 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/QZHNC2546725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d321ea7a68c124be8df8d21fd5fd50e7d679ef60141de31d5099debfc5a4e6. 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/QZHNC2546726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2de32183f480147bc13e85bbb9fae414f5bfc6c331e8c56059d19b1384fc5f7. 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/QZHNC2546727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9ebcee098dfb8c3aa7a0c223de5955422b22b58866e5dbbb963fe4300c1164. 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/QZHNC2546728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebca33ff1c3282195151dc468a6e3670e01ffed3c47e6eb98ec77bf9215939c5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZHNC2546729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c5ee7329e559ed6c119047af31940befafb72403650da6d9234f7633380391. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZFZ62503521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49af2e373e9fd361241bac3fc77c0cfb49e7fbc702234943d18453e9b0c3c662. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZZ7S2442180.