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 0x7fedef62ff38d19bf3ce236072c18609e0411a88dd9db805fee67490bb7f9b36. 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/0f53ffca-d0f0-497d-bccd-52222c4a6802.json and https://artists.proofprofile.net/proofs/artist/0f53ffca-d0f0-497d-bccd-52222c4a6802.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 0x8ba9d3b027c796f4e1bd62602bff9096005e353e83d56ad9e6e3359ee21c7427. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEPI82402781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aef4f9d5ab71013f64fa395cbe0604b40e4559edde77d0fff5d06a11f5d37b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/DEPI82402777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50147d18037bac6c5654d03a75a851522c05ff27cd662bdcc219b4c7ed7630dd. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEPI82402792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d2299fa0d9268682c9ef0aabce68ccfe646c204021b0b9197b60f6e6ad7591. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEPI82402786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b8b5515aff0f4a91a570f8891eb9c3aa7b438d191705895bbb5a8772b028b7. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/DEPI82402773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa811f4aa972cfa5e1a8d6f9e28a8d7afa776103752fe6f83a5ed9b8e205ca22e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/DEPI82404436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3609a468adcdf05ccb14c8cf6c11236923d4a66371644027cd58ef0d50a707. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/DEPI82407219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34aa2032558818eab2cdabd07fda6620034ee65df524a0eeeda214c50bab9f1c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/DEPI82448999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffd0be43817a29656960334f0fa53037fac04c3a2cd4d3fad8723a6567ae42b. 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/DEPI82452484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b5056aa00a516be441ff050699a49f70eba79d65d8cfc93bfeaf0278a9fff8. 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/DEPI82501183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8343a01a49fc611cf6482bdd476fa93ecec13d259ce18b264ef6812f748ed3. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DEPI82502451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b442d8c7a1ca8769409386db5cf73dfefd538dff7ef50ff6338d8a0d1571b2. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEPI82502453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dfd9f12f1aa1fa23dfd7c476853acfa3a28c31410df7eb6cb2bc2528635bb7. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DEPI82502456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9264971b1c1499c9be7a4d5a529b4d99fcf9b2ea2a0ec46c11637ba27cae83ab. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEPI82502455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc012d942cf727cfe203b24c161b16c21863260bfb52287022bdaae8d708224e. 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/DEPI82502457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a338c0050cb5cc2f124dde85ea88716e19fba909840e072a7d0a7f249564baa. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DEPI82502461.