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 0xbba356d5c1ac2f8712326ba46e909c21c93830c3746486f1725ada6894a4cf78. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fa7123c-1f8a-4cdc-844b-2115565034a3.json and https://artists.proofprofile.net/proofs/artist/6fa7123c-1f8a-4cdc-844b-2115565034a3.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 0xc1b7f89850b10d7b6da48c33b6622520c300d0c1f0b970c4e36879598c2c313a. 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/US83Z2034120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79348dff77d08df0cc55f6d50a44e7a7ada0cb54c72c9bc37b1dd1ce1abcb497. 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/US83Z2034124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd77f00e0c032fa98e0cb255fbb440a8f2af65a2e8f0eb884f9da996baf2f7d2. 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/US83Z2034127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ceb7904cf854169eda454a11ba8e95e59eedb878daebeed6c7400f24c1834d8. 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/US83Z2034114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1f848f797878a21500be571814eeefeeec0daf35337f16b0d6d5fbaa861792. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US83Z2034115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e068c06b736c133a7348a2460e9685d5ede972aac181611a4957efd7c43a06. 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/US83Z2034128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d1672048389bf4d440fae5a09e7f7d7f2526863379e4f171f5395ccd4da535. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US83Z2034118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08b60b6f70d87d0431de7d5342106503725b2ff4fad66a7335c6063446612336. 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/QM8DG2063470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4081857fc92f520f2fa75e351583c5edbef6b0ce293d7e3bd27bc44bb72bb6. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBKQU2087990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e5543f2937a8f300c625ebf8549c5e2a3686bb63330c21beab3c9ecb157cb9. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/GBKQU2087991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0dbc80f5ed5ac55fcfe0dec2efd2cc7daf21c456e184cda50619d0d573cbd5. 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/GBKQU2087993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b57947863e9c8a07b48f4c7611143144b2af4b39c01eaaee22b3f26fa7e9ca4. 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/NLCK41092346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0474a7b31ad753d16c46abe2d7c585d4fdf16497c21910b9c5775462902370bc. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLCK41092352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312a79cdacb7f6a7f4ad1c4a9f54b886d235286f9f2596d54e0ad32cb8090339. 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/GBLV62002429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a8c9e6e84aa3d522a32f73a156a6cb18220e5b7422dc588fa2da6d7d664a75. 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/GBLV62002434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a0bcb14cd4ba21c592853e46fab1b8d4187631d9da0d855fa3899226285178. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBLV62002435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dcd86316d97cd46ddcde1f1a2273f762c96844778767012f5aef1c463246d77. 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/GBLV62002436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83363e3425553400403cd26888780adc8b273e8990226c00beb2e1e646a0305b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBKQU2093539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506c7619ae748aab6f9621e9c4ba7444b594ec5d04202b0d349933dfa34967e9. 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/DECY52102512.