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 0xb872782cfbc03c5fe395354d10df865d708d49affe2d03d8f9bf0c146b606a92. 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/2e2999ff-221c-475d-b1c6-aa8f1fa7efcf.json and https://artists.proofprofile.net/proofs/artist/2e2999ff-221c-475d-b1c6-aa8f1fa7efcf.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 0xba9b2beff5ac7808a78cb369f881efc7672a6064f8a0bbb4d907377410ee9bcf. 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/TCAHQ2390556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ca04cd19664827b394146c8030b150b17e32f07013987ddeaf562cd2913b58. 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/TCAIK2414516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9b2beff5ac7808a78cb369f881efc7672a6064f8a0bbb4d907377410ee9bcf. 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/TCAHQ2390556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6907f3b8bc1fb51c41a942a8e79d00b83d2774a4f48d39076f9856aaba470f. 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/TCAIR2483981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0927bdd18d82873553e05672c4ab768556a20ff19950e2fd2a79fb5665223b1c. 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/TCAIU2465495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8014024ff53b027602ecd2aa58e608c13e63bc7c6972eac50994478bde408c. 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/TCAIU2465541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebb65acffbef0e64196c27bb6cd9f37a96661e36985e16d2608aed12e6ad575. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAIY2430417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c04b5608bad2bbc9794921fa708d6e0dfe16697b32ec5d815264bc769992e18. 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/TCAIY2430295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ca04cd19664827b394146c8030b150b17e32f07013987ddeaf562cd2913b58. 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/TCAIK2414516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9b2beff5ac7808a78cb369f881efc7672a6064f8a0bbb4d907377410ee9bcf. 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/TCAHQ2390556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc0819a0b73054b4b85d06a74e2ab76d8555c20111b57d35267c976780fc77c. 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/TCAJB2409244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc7c2e4115c71cb684aeecd1532faf390186c6e83f32456e664405850d40052. 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/TCAJD2462669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c04b5608bad2bbc9794921fa708d6e0dfe16697b32ec5d815264bc769992e18. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/TCAIY2430295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ca04cd19664827b394146c8030b150b17e32f07013987ddeaf562cd2913b58. 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/TCAIK2414516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63e4cdf9cd229ef20baa349ee97f8e33e1593e17fa597080078cfeb714c8e29. 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/TCAJK2541283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2410e2fba099721b84eac7f436fce57230cc9be35ec735c5df1dfef68c496ec. 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/TCAJB2409144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6907f3b8bc1fb51c41a942a8e79d00b83d2774a4f48d39076f9856aaba470f. 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/TCAIR2483981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea58a7a79cc30bfc8091156dd9345f2944a566671ba0b2a66e19ad4623ebadd. 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/TCAJT2508226.