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 0xb22f1d524639c127fcaeb4e3da4d9c39426a1c26d06e88f1ac409d6b74543cb8. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6886c2be-3227-4cff-9d86-536460e40613.json and https://artists.proofprofile.net/proofs/artist/6886c2be-3227-4cff-9d86-536460e40613.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tàrrega... de la guitarra d'Ana al plectre de "La Tàrrega"
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 0x76b4d806531eab3b499ce6bb8a5835063f5e0dee79ed6ffdf5154c46601d842b. 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/DEVU51807452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae386f70e78c028dfbb2f1deedda351da862d8e3fe0920ebf9285403066e2d8. 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/DEVU51807453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142526ec4f58434ce737019a1cced4dc3ac35a03b60956feb7438a661f770efa. 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/DEVU51807454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee5b42cd060476e15a091ad04c49a73bda842b168336e2335a34c637998b987. 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/DEVU51807455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa6bb1ae81b4aea383bb3c0afc9b962a118c797906e9e243b779da3c8bf8c9c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/DEVU51807456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13e25c3ac166d3bdd2da36d386d554e63b6abbad41b239d53949734938c5b97. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEVU51807457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a9277ac74deb900c3ee2c71cab3624b5dadac71ef4453a0f1b79de41b96b9f. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/DEVU51807458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97fbdd1ad7e3c692ce7aab849dda2f1daa142e4392bf2bb5a2258b57fd77d08. 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/DEVU51807459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa994e822b7428c4fa26b1027e5c54be5a06d6cbf1626883f270214372bcf39f7. 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/DEVU51807460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2436b4eebfe3c21d519780ffd30b80ae68f84df3f8d68fcf4a90491ec2fa1f1b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/DEVU51807461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f4979c3b81d74898e634a9deb99992cee7a639c9a9b865328fb82031856424. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEVU51807462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb8f4b83c8261e0c52a7360aa9a696c1c02d2cd5210b76493b88faaa8b0b522. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEVU51807463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39179035ac46f74aca9f0d0b0d7f06cda8cd33c4b915ed37a69de351a519f598. 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/DEVU51807464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0b72daa5600eeeecaac773b01caf42f5283daf580325b442168f3729a2a7af. 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/DEVU51807465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9600794da67482a1e860044644fcac44323c9f897b1e0ec85592da26f4de88. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/DEVU51807466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa014f3429ecadb822e78ad70e871d85d81ba649bb8b2c3e9914c12b03b9baaba. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEVU51807467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc631d461ec9be4e38e7babd0a872053501873a2962e6ed413d5536f1463084ea. 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/DEVU51807468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6528d10b9ae575ea058c1c9bdf21a63ffe0f662728e3fe0c1b6b2694c56bc9. 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/DEVU51807469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130a996ddd0e76d8ef0d09b77d021144facd22c5b211312809708f50d457cf60. 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/DEVU51807470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec675e7e21776dd1f149c46b6f99689808779dcce23bb2c98df2a64e55b5093. 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/DEVU51807471.