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 0x36fdd94905ae7ba11a8249545b91bc46b2d9d5c7e08592bf6d50b74defd1bb24. 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/4c7c01b7-d1a5-484e-b259-be2080f159a2.json and https://artists.proofprofile.net/proofs/artist/4c7c01b7-d1a5-484e-b259-be2080f159a2.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 0x81fb57da4927861aa51eaeecc77313e313279eee3ea468682d1fa68f11cdefb4. 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/ES75E2205297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c70581252753cdae7c1ddf2712920a817a3e68c9260ed53395f13c5da40696. 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/ES71G1924130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e5c7a8522be11753f830b397aa2ddd1555985c86e905d44f43abb86ff2f4f4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES71G2405781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed5fa941e9fb47f96687ce3cdf05da5581a817317d280de3f7f0a5e9213136a. 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/QZS7J2493780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d182137b900958456c55df76c945b645bc230da3e0991eda7c27d8f5c2ca7be. 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/ES71G2409147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd264946a33c5e34d3bb995b58d92535885cf21929c472a5f06a106490e251f. 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/ES71G2329257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665d0f18d5f8d36bb7851e7d328767fddce222976cfce6fccb24544e4223f214. 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/ES75E2300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f08f32bab2a92324dbe225f9704ef6748da7f0eab6d063fa84f6c59faf4c7d5. 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/ES75E2204723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bc4249d41ac9713ae15157e7d5737e3f58dafa08aa733338716c589aad861d. 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/PT8JX2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8b0c5075ad5d0605ec3293cd83749d4e8e6be695e7683ff930083b6cee1bd2. 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/ESA011561245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacc9daaed67ab084e9f3202ea5a198efb452812599838089efa3468a04397a9e. 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/ESA012188059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55178b5ae4a4d2c439d3d7a5af5b437a07eca8a5abe04900a99341bda628478a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ES47E2000021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b925cbeb97eea986e920e5ddb2b2c535635f0add92d4f406046ead233c9bd8. 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/ES40E2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab8f547f880d2ad36c6f7a1345beca48d09f848fde172111c51697a6a60c9ed. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PTBM12000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e052dfe83642158ec4e631645a63ac96be51bb2725c84b0152cb1147c3e5cb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTBM12000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1edcabbc1cab297a2a0e109b166ca2af60f386da4c3e67f9ce9d2b975cb6c5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTBM12000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19a80975a690caf4b1cc7d19f7dbbbf3ad3b094be167328f6597362b4c23bc61. 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/PTBM12000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17401ec3c1b196d8ff95dd80917f8cc132edc17860081f243ca649100aa896cd. 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/PTBM12000068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ad37dc45f94060e528db2347f00c3a33b43ef6f6a326e395cc9119c31bdb83. 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/PTBM12000069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c925ae11f75464b2a7d27d2b60eca8c6ce2a055d5be03a8757ef20868fc200. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PTBM12000066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd24edd2a4698e3a1152430d707d26fe469a6f55d3d6415b7c107ed08b4b51f2. 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/PTBM12000065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1779aa141b156a60446d5a40dfbbe0681d053c45d50494bdb77360c8039fdd9b. 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/PTBM12000063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d642799ebd0b7b898ee01f2938224c01246ce41304ac541c6f747acc44fad1a. 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/PTBM12000070.