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 0x7c452b4a06b82982e01063a663fa2b6393ebf3776fca5549c5fc53c9ce2859a9. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/caba24bf-7085-4378-84cd-e7bdb6f10a33.json and https://artists.proofprofile.net/proofs/artist/caba24bf-7085-4378-84cd-e7bdb6f10a33.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 0x67a21ad17084fb18dd66dbd4ba7f650ace5dfd672fd80313bdaec62c0075b6cc. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/USA2P2130630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547819d0b542e9b469e19ec3eac87298e6046c4b40bae4c14aca2fdab132faca. 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/USA2P2130627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a9d2d7b049572e5536ee5294ccb22a74232cb1b0fa8cbeb9635b1b6e8ebef8f. 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/USA2P2130633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1020150606d259ba70d7df23bbbd889af628bc59176e2d288aeee622f4f9d6e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USA2P2429221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a167aa7770beec4eec563d9fc317eaeb72f654a7d25f9ee8d7ef79ac79e300. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/USA2P2429250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46a29d93afd4435209ac91058156847f42224a3392eb0858b7b07294f5f52f21. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/USA2P2355036.
MARARÍA LA DE FEMÉS (Poema de Rafael Arozarena)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3611ec2d9ee8725235865683335d0d2974ceccf599606cb9756e59b40391e2a9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USA2P2353853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6e4c0a8762a5a7807173e358f381d3bfb47d49ad04bb437f6c65a38cf0a50b. 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/ES5152300654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51ba6ceb40671609c495b33baed0e264d2b01d654104fdf671f0192b6089d2a. 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/ES6102328603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2e3eec06fe94d3ba1dbe030de90b15c7896beeec61fe7cf52c0546bf5b9eeb. 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/ES6102328604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc946334930a392b3595be002d8121280e211f725b2a77a7e3696f26e43896c71. 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/ES6102328605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07eac84a43e1c0b018b36faa209646eb1013160eee7051da796ad4f8e1bd14c7. 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/ES6102328601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e02d8b29b3e3941d113ba2ed890f8e5961abc96ebd43dc9e4bb3e2f35deea98. 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/ES6102328606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3648e7c336687aaab226969e97230d1020712dc516bed337b60898d708b347c4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ES6102328607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670f188e46e7aa81934cc727dc5d720116944b01790aef6f00839bf8f5863f69. 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/ES6102328608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffda6af254d789fa7e2bb1ebc9a5c75e3245de0bd22b724666d35ff2266b3a31. 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/ES6102027211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94912c487c494ddc1f0a6eab50fbd115d2a063f2873385ee210479ccd09bd812. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ES6102328609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbedd5ef8aaa987083f03a2fcbac5281b5a1e7e8ffb1bc16c6cad0c9873092c. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES6102027210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3005971cf44b1e87eaedbb8fcbaf6a8acbc598ca06a24adb56213c136b333502. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES6102328602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0569b1477eecde6a68720068b8b097137211dae32632b8c5ffa45a0595f1af5a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ES6102328611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154f9d9d270614929633357ebabeaf6c5ecb80dbdd20e81895a10f230534e8df. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZZ792470760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d3c2f0450ec4a1ee770ed3745f525144e7a532d0cbb73ee2ff7a9343b74ab9. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZZ792470761.