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 0x9b0a4f585b870bf3f966b6860291f7a8a711d4729d6d220b5c7e5ed4ce20068b. 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/b5a902ef-73b2-413d-93d1-790e40825aca.json and https://artists.proofprofile.net/proofs/artist/b5a902ef-73b2-413d-93d1-790e40825aca.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 0xbb8b5546aa43b4f918b8eb9248943e3cc63148635208af62d8aeddf7e432fcd7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMWZB1611942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dfc5a7662a00cbc62c733fa419c18a31b4a0d00b7c207aeaaad066424457c0. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/USA2P1683916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa1f4851b16b17844a74702a4cbf6da6a0bc5313714c82f83c0060dcda0aca7. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/QMWZB1610110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc294ae48ca48563da76932458113ee8b0e8d5e3ba07be266079e90d974a0848a. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QM24S1703004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09d37f0383569709ce20fb6c6e759e8b8eeb356c7787954e19dcf69c61fa9178. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QM24S1703005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f1f3d4ef862a07ade66fc11c19c07dd42986cd9ec0c7d30fa1dca30c607e10. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAEL1982749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d5f9efd503e536089e949831dce511a25caa7d205d9d0120e5530e5a56755f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAET2020193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa163c09443fbe1506652ce4c4e0194b5f9b42959345734d68f9ff526a4fc317a. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAEX2062909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e74c5a2fb15e73d574e8d0e8a589ff5ff1ca72de52e1f14c6c5329e3cd3f6d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAFE2010927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f1f3d4ef862a07ade66fc11c19c07dd42986cd9ec0c7d30fa1dca30c607e10. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEL1982749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34ee48077e0b8e13094264460242c7cb9a67e90b13762c2b1fc5c793ec975e7. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/TCAFE2010944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f39c45a55b19ee0e02bf0ae00426151036689c5aca50779dad9bfa5b3136bca. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/TCAFE2010959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a623ad738b5ea5f2074fada6604074c531c51dfe6f6ccefc40984ff37df4405. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAFM2146145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9c10f3149155345a55171c2bcf7f9407a678c7a1d35ddb15602c201f2697c9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAFM2146147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92d1dadbecd9b79b67597c4bd059696b9a2b9b984a038cb22fd4097b7115916. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/TCAFM2146148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ebd9a38809dcfe8024c71de8da1588483e7df856cade88030c0bad95761b61. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/TCAFM2146152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ad699bd91867613a76f7f91b17d37f7f2b588612c0a00c03a2b1164bb06e69. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAFM2146159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c45dbf6c4013e5dedc0362100941813ca5f5875bd4249e55b5246e4f4046566. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAFM2146163.