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 0x90464c34eaccaf5a22ec794ec919e1230b08fc6175bfa2d0efb3f95678d5dfa0. 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/cbb878b9-f621-4626-853f-bea62a84211f.json and https://artists.proofprofile.net/proofs/artist/cbb878b9-f621-4626-853f-bea62a84211f.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 0x6311eee199034c2afb1d7b4b272b0cc4daa595a9a95817ffd6af1ff51e7e7971. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/GBKPL1822928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cb865ddc2335d0d6235288e80a1a82afaeb9e516e40d0f2131e1f6345b1e4e. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/GBKPL1830190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cb865ddc2335d0d6235288e80a1a82afaeb9e516e40d0f2131e1f6345b1e4e. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/GBKPL1830190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4d382bb5f6c14794fde5dc6ef99646919d283aad65c32c2adaf133e60196d5. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/GBKPL1946214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077bca923a1cf22e58342952354325a0961bd7918de7f39e640dac27ce7c83c5. 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/GBKPL1946213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77002faed2a6ff4a9e43edbef9eb896cc87538014672b7eef3576b583cd388f. 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/FRX201934860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29ada0222d71747c12733cc303dec6d7aa75564399a3fae09e52b69ebdcd4e4. 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/FRX201934861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc681da49650c6edcba264fe6f9028f5aabe04fe56f23c6c5ddffa6940158f7d9. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/FRX201934862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358bf1b0bada3faf0a20eb689c2be23d96fd4b03ae1e1343986ba8aa5929a60d. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QM6N22144910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfc8ff5e63298a3e595b5e4a91aed5229064fa772226109cb9864257e16eb4c. 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/QM6N22272809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4c4a958c47c9a7a99cbfe6b4c8c792b5203a3ae89d49ab577dc1af721f7661a. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QM6N22273182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4fd612118a25e19c559352efc38e1e5359daaade677592e7343ed223b146f2. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QM6N22273230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9d63976a39619933cae68f5435de1f8492001ad3078adc8fcfe3e599b3f3d0. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QM6N22273293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85b38eb25666c8f3b8154810daab12405f8bbd8f5b895692301a6b1914c9d22. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QM7282399677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe53827487aa0a72952becb54d06396379cf75d036ba776fdbd3764d5c3c0f7. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QMBZ92303380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362e28e78107e4b810aabd16fccef2395ff70fef7d1df57da57939e5622e9cad. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QM7282398941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08f4c27384339cb38a0506636159a3242502c236e8dd5664946132d5f1498d6. 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/QM6P42360778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba367b92fa37ad833938a6bd8c8a31314a69597bc6a5c15996884952a5e9deb. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMBZ92303338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58df517ccac719deb3ce3aba5e45db7f7cb7356788733e7858f6f1b0cec74f60. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DEXC82500102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58df517ccac719deb3ce3aba5e45db7f7cb7356788733e7858f6f1b0cec74f60. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/DEXC82500102.