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 0x21e999ae542176148a71e8f6a15e41f6820b79e49e74371a373fb3c9f69ed96a. 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/dffbba75-1882-43a1-a3c8-7fb24a5922db.json and https://artists.proofprofile.net/proofs/artist/dffbba75-1882-43a1-a3c8-7fb24a5922db.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 0x8a902282fcaa43bd4e2e6fe8a17d86ad130cd512197b7c39ce56c3055fa6ded7. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/SEXGF2396702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84baeffd5f2b8c36db2bac8372be58300bdf2616001d4511d3e0de33ca1845c. 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/SEXGF2396703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f36e51b7286e0479fcc9ae193257eb13181331be8e2c5a0957524120faab2bd. 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/SEXGF2396704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c13ef05f5c6bcb6058b5a86da9b66fc05503ed79e33dfd95b840a9243cac04. 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/SEXGF2396705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x258e185673720ce29a6e5b138ec076044b5ec1996498092e95312ea89457b040. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/SEXGF2396663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915a9e543a04527e955142a70191e85b378da854e51c17514ac0259f5a7f3679. 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/SEXGF2396556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdec6557ebd55c96ad9f872da2ce6cce51c1cd33c35ffa8016f92ca111a00f20. 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/SEXGF2396557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71c1b03310a1d8b93825672b3a5907fe7e1f3a326b2e43c4a01a5e141002ffd. 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/SEXGF2396467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7cae8c03c298b2a0087962dc35f0d7d16452a314b7863e17c319010ac0c1cf. 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/SEXGF2396352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92b0df708deb5674af2d020d60b4d34dcf16229e98564288169f6751db911454. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/SEXGF2396305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660b5bc767615465fc11ec3413fc3d0ec3773cf04d9a1cb18357794a7809c6ad. 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/SEXGF2396306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44594c004a9cd0150ba82a4d5849273c4efaf4b60761695616ff99c17ae2dcea. 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/SEXGF2396307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddebc8baa86e59df799272a6b5d7be927a5ee450189664344675d484e92ee7dd. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/SEXGF2396308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe364070170bd779c5d72d99c291741d7e62860b2ae71d25e35e452e82b4a8f71. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SEXGF2202947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8c67e6e436b72182c61a43a72a539214da7ce8769fbab358dfec6c6dfd25f5. 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/SEXGF2202949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fd00497b139f10d2c8ac799148c028c47122029b4e1232f46a09341e84fa70. 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/SEXGF2202950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c0fc290ba43b3d83b94363db914628d33b9889b54cd793badc059d681da1533. 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/SEXGF2201857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dc5257a01e5426949cc1ead17a23853f9c27be724a0eec005ddea1dfcd0828e. 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/SEXGF2201858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be01d0093ee5dc1fbf75dd8fa0a9e74ec14e402eb0699ccfbc21c13782a4c48. 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/SEXGF2201859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x940ca2886767107310a2b98f87abb036dbf770fd24c90707d88693d54a108a02. 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/SEXGF2201860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8677d4e08ae8370c4d4bf1283cffa309d41cd9ae195931c00fdfa215343c14d. 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/SEXGF2200252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0369f5d3bc1a2faa8bee584705bfc373c05123da7216ba4a4bf3549290aced. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SEXGF2200253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa61acf93bb53d56c46f71e44f4125c1456c0f3880a3aaaad6a5c5011bbc9aa. 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/SEXGF2199625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e250ca6b3d8293811f9d5ef94f9c3582ee7fedf283ca373ba29eb68390392b. 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/SEXGF2165001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97df6f5836a732b077ba723d5d2bbca83f5889a2014c3468405a69df0b4c5956. 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/SEXGF2165002.