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 0xc762eaa876ee35ae91fc2e282bec71d0cf732ebabe8ef68f8839cc73fc52e01c. 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/e4e5d31a-94ff-4d72-8883-d60d36db5da6.json and https://artists.proofprofile.net/proofs/artist/e4e5d31a-94ff-4d72-8883-d60d36db5da6.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 0x78500e020dc728a27bd3961321aec14f5ef52c68777a403ffce4a444c45f9dd4. 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/PLB382400216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207afa52fd0981d776151acddbee7e84b48dcd95d7f5545ab3d45ed4527e91f9. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLC062423985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b02512cc16af1e7f634fb7795f668a0c4794f565df5458875f03a6577348d84. 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/PLB382300547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f53e78e386b722aa49ca13763874565db3863c9b4272c7807b2ebdaf2eafec. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PLF242210902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7e9b3cea3e1f077d9c8800bfc0044baff97f999a5464afbac55407ff64b878. 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/PLF242210903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc066b272b35553672782cfb5d37b7661f39aff4373abaa43ea2b23e08564181a. 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/PLB382300121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a703b0934578220fa239c82f5a46f0167644136123482f9848baf5cc9ac506. 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/PLB382300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34044c6f37fa8cc9c8ada3109595a884cff09422afb78e5d52139b94c4ddb06. 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/QZDA62243448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77798106f2b4f3f13a7df9b7926420bfdffeba7b05ee0c4dd21b68d1c1cba94. 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/QZFZ62265341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670937836f55d3d8427a487e1618a5652773bd0a51105096a15c7476c8e53c47. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZFZ62265348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce79fed271c3aa2c4cb15923e736a48b639f5d205443855c51f45f44f13e595e. 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/QZFZ62265343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a405b86f7ec46f5ec72ce4d70c336e1f4f8dfce5d7b4c78ad7b6eccb746f494. 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/QZFZ62265345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c827cd13ab93ce51415b46363c7266df25f5ffd8064b4cb108dde465345a0da. 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/QZFZ62265349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefaa98a75a42a4ff18235eddfb84d3eb9e466080c52f8f4480ec8f262684b690. 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/QZFZ62265339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175ac10164b833dedc60768500c7f9f8d636a7b418e1db8f2abb0b64f670368d. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZFZ62265344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4a651eaf1cc2619ba6ebcd200c0e56817a973b6563b33d930f59b538bd48f6. 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/QZFZ62265346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3eb2592f55539b5529b0d8d411d54b61ba8d02088ea1a3b46359d2cbaeea73. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZFZ62265342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8cad2a39619561d2cc17b44a36bf3d96a1aaf8014d8b98a9338af2cd0b16cc. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFZ62265340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf692f9985769d871f98699ba6e5c17d39cf7e687e2dec2f0c60fb51b36520d68. 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/QZFZ62265347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153fd1403433b6204d8def0bd468bf7d6f8ec072f07585e8b492447ceafe0bc4. 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/QZFZ62265350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8baa48be0bf911f8ff64b2746146fc026525ca91c509e07429201d752ab5f8e3. 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/PLB382400415.