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 0x1f4d975bcd4b8d3b6e1a0bb8c208b843beb970860dd54d257804edac9eec583c. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/491a1848-fdf0-44a4-bdc3-8eb6837926cd.json and https://artists.proofprofile.net/proofs/artist/491a1848-fdf0-44a4-bdc3-8eb6837926cd.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 0xff2b0fc4f0445c3f479bf564024f27840ec1629cd3b1fb27bb9befa4cd5cccdf. 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/FRX281977319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7427c70d1c6cb01b7db32b98c4849b1324db458c59f1ee1baa91bb6273a1a30c. 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/HKG731775776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc125412148de239113d0666b35d24f57077ac9a869ab19735ef665f4cb897b3. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/HKG731781720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f056c087811a9f8c80a9e5247932c950c2e74bf30c9d6471eabbc66e2d2f1d9. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/CNC072300249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8282fdccb6ed6cf9f2bdc644cb3db198a8c0695fba133fe592e2a514b2449602. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HKD012315052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a274aef8fe9f3f297e4458a9ce86dad33991729647066f296354d987f061c6. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:23:19Z), 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/HKD012375031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2893f51ccffd605044eecb8596ac84bde2d9222676cd605a9132972d3bb519a2. 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/HKC992725772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b39b7ed083664ef12a35313258cf98c3d7afe08036fa579b4a334c013dcea4. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/HKC993024737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac96b8efa99580c10271a6f5ac1e687f3c2c818e39fd9b7fb569ac92efe6d0d5. 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/HKG732546130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfb05075687eb6c0689a81930ec20762e7233e63c1c094d8a0adc59db84af702. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/HKD012679959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7c9fe82e398572edde3af90959707d8eef7e0dc94712d33970057927bc8a0e. 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/HKE672501043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13c8b9c507030ee602b53ae367687510821d136a1d6b028694aab6f4d187312. 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/HKG732105732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf42638539bcefb20a6e9ee0939b4f90130d403dbf852f24a106d66bf667dd6. 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/HKG732105033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985eb61971ed643bf60d26c02c4eee10014cbc622c58bd3b0f6eec7bb0b473b8. 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/HKG732105026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x965203f973b3f80834d10ea948e9ed63b0ae2f81a54c55edc81e300936650245. 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/HKG732102506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12ebb6f42aa7b03aaa4d61336c6ef7291483045b2b19b990c95719e121b5b26. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:26:09Z), 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/HKG732102846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b9e313a77bab2ebda9192795e06cce47876c9657f125c4ee8b9432df9763a4. 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/HKG732102992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d55dfb3ce83ccaf02724615fa0eeb5bfa0b4eb1fb66dd0832c7a6fd3a0b62b. 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/HKG732102994.