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 0xb7b2a4d7b9b59dbf7b6367109df74d2d3230cc1af2f1aac8edf73366c0e24d77. 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/261a0bf6-53ed-46e6-8cd3-993d947526a2.json and https://artists.proofprofile.net/proofs/artist/261a0bf6-53ed-46e6-8cd3-993d947526a2.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 0x6a3f3dd2103fc32fae2b16b5accb2084e5465fb1b022bdc92e5010c55890e993. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QM6N22131029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5811a1e27fb36728daaac7ddd1f82a64a0e21683db47ebbd940fb258f20995a7. Chain 2 (Bitcoin): anchored in block 959071 (2026-07-21T22:56:27Z), 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/GBWUL2150649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7a5928c6bd1cd16c129a99f63f3ba92551adf8ec9b1b7f3962f07d89ba7f9e. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZTRX2112176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d151092c320377de28cfe68186aed42e324fda1dfbb5fb3f810096be281626c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/GBRKQ2263569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568a31a4502a5f77cb813c3dc1387d99095f0e8ab8f88326a7a9126f67b63e57. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/GBRKQ2245741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28fe143a496c6bba03e5549c228609bf5ce317d1d85e4454795ccfee98a0c47. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/GBWUL2215742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e84c570de33bfec7b4bcc00b3bd236d59bb12d32c3685464eaf62fbe9b1af19. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/QZTRX2240079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bd803b940309ce9e66d7bc8de2bc2e5345dde5aa71680e089a1e0f1ffb8ee8. 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/QZS662232552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a65b16c089cb6a73d855b857e0330430d1505f01ed1e512d4bc7b618c7c26f. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZTV32200492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89de0636f9a660070693c8f693d7412affe17c8ecb41ba4bc735036a7cc3157. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GBRKQ2324230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59cc0ed2cf13fb42d77d7fea606820ca47ef5abb190950e57ff0671fd139417. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CAQOI2304581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x380f55cf39d142ac1d503fc0d59c9d689c0588d47a6460ace50ab51e9aa9933a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GB8KE2326300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14732477af3afd9dceb7a04c359ae2f9c8060bfd4286b0a7ccb22d3ef48a0d8a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GXBDS2354283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaca8fe38d4c0bfbc6a2ff201bbc6469876eb033184d8761550adc00ab15b202. 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/CAQOI2402321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2ecf5321b9a595d780f8d6db40d21470df7c1e12f78d5336b35b71736bad6e. 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/GX5MY2378849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e803f08a274f8b8a22856b78597a18765e891c5521ec1018e16a0bcb7d0ffc. 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/GX8LD2529189.