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 0x4e9614c8f3c5d6214f567f1896f1f24449f385d826e7962dda52fc8c8f372b06. 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/ee5700d4-6fc4-4338-9d2f-b70d83c55f3c.json and https://artists.proofprofile.net/proofs/artist/ee5700d4-6fc4-4338-9d2f-b70d83c55f3c.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 0x41b3693c0f9c571d351e1cfdac9cf5d792c6a1ec031ef56b141feb9c87d4b403. 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/AUCN32200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c725fa1e81e52e58df680fd772d954f31a0759abcea33a0cb00fb2e7b045fe. 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/CA5KR0037268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246a97c4c26560a0e2d4f1055b488d4158ebb5759650fe09b386b156fe5ba4c4. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/CA5KR2224796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4884b2b1a8a8c22d362d38bb45d5472efe53be001dba818acfe90091441f7c7d. 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/CA5KR2247503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c595dd78dd9650b0e798d67e0118a5e4cfbaaa811d13ecc9da1c2a97a5df7e4. 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/GB8KE2305046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cb3a257eecae5882938b96008cb76229110b04d1d7eea586ae621432f07014. 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/GB8KE2306898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40fa815e6bcd0b6413a7560abc09a4b8bd79ce9d8d5d8f25fcec919cdafb1a43. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T14:02:05Z), 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/AUCN32300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb4771794265258377cfac03628b2fbb22084bd6912bff2a0f0b69bacd2ee0e. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/GB8KE2308886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2fd7fce28a03bbb0d3dfd4aabae25ff8357535ae673125b6974ac324b30d3a2. 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/QZMHK2351557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bd3389980bc4978d7a13b5ceb4cf798bd75efe0708bff3612aec309ffcd6b3. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:38:07Z), 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/GB8KE2318160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0fb266306d4def7a531cfd4c1ea4aecaa45e9bb6d975af67e29f2cdf9ff3c7. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:38:40Z), 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/GB8KE2320795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc390f123695e0f1ffad4f937d334da109f697ce6a18f89beb400f53ea7c5464. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T03:40:11Z), 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/US38Y2308391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0888a57b6849de2dd6e3751595aa0c9eae0421a4a5d735e273f57e29f59adce. 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/GB8KE2405227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b51fe2ea51e87fe75c07a234372072608257408a7aaf93980a1e1d797dec4a5. 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/GB8KE2413680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf577721acc54fa7058beacec592528fffd3a20103d3280b5f5ddd660c419a799. 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/GB8KE2517468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff93ae4e0bb3d2e184c0cf2f4497d6648dd207e35321d9e351c592fea9dc187. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/GB8KE2519282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76aaecff26b4a9494c02ba16f7b8cea07708bbf354b3e026947f488350960643. 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/GBENT1710591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f95e9a9132d744a9e7ab2972f1ea79b1c5772b498fb7bfc7ad52a6da0ea88ff. 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/GB8KE2215851.