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 0xd1c9b03d6a39096248c8de2d246d3e4f39bc5367070aa89a73f283148e24767e. 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/e90b6737-f50a-43dc-9c20-9004772fbe55.json and https://artists.proofprofile.net/proofs/artist/e90b6737-f50a-43dc-9c20-9004772fbe55.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 0x4c3431dcc44628032ddea0d15c2ad35918209b8a74cf7ac8cd29eed01ea5784c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DEQ121748484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3f857f9ed7284e524b7a6be61823d39a18a1a831a22313dc1b0780486ab4a58. 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/DEQ121748490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4789c5f1d34946adfc27933b6adbacc93b34053d92053daf356cf7d89129d3f0. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/DEQ121748464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8142391423f48c08b56cd26a4f18fc998bb07bfcd8b7b3c1ee9f78f22e5f0d2. 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/DEQ121748466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0342b235f5c083926d33d870cb9365520dd24c4b070e3b5d8de71c1c4f15cd42. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/DEQ121748475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526bf37957afe78e66ff449d5c6909da87c4aa21bee4392a79c1f22aa07aeb58. 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/DEQ121750093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac36934629ae8b943dbd210a6657c9dc0dba3101255cc26d8d964a7d34b784f5. 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/DEQ121750095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740eabc6e3ac5e95e8f2a01c5dea2556f12ecfe3c23ba5adb2a9a6fa421b2375. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/DEQ121750103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5646820f543c7cd614f64896e80c74b4195de47282335848cd0c9ef164c2a492. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEQ121750105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b292e707f06619b9c90a3945a6686b0aba89a71d636fcd54574ff3632993a1. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/DEQ121750094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed387ccd1a5358bd7729d3d1eac791b99459bae89fcc14480b8834ebc0439072. 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/DEQ121750099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa02c3004479bae2e6eee44330b7fa8ecad9902a4da1df072d29e95f4b36c589f. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/DEQ121753602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057babca3833aa8101e48bf702ef862c665892d21bc266026ab5fe6e39789ef7. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/DEQ121753605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dc1720c9668a7a2a15b87c0ae1d208347a1690cf7cb58ffb9811bb88f44054. 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/DEQ121753607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a3670386c7ae880de21380a819c079fb0998c7c9ce695a5022fbc2c54c26b7. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DEQ121753606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc362d3404fc55ae177b034598129ca8d5b15b848ecbed15404a072c4d141e504. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEQ121753610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31b47843039c8f2f61186ce4e678bed15e2c521e08b03f76ebf9e85547a8752. 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/DEQ121854672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdde30c688a9cd9a0253102729ff16a371483d83bf84531a1dfa0d78e7b2f16b3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DEQ121854678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69269bd3d5f92bde0b8aca52d476c7c675ec95f5f0e86eb905a95404f571f1e1. 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/DEQ121854685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4627423ed936077ca781537a209823b7524d45f55d79a8b6e601e5a53008e7. 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/DEQ021804811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafe46b21fd1f871157c3d09329aa16f89ff69bcbfad1e90a8ac7779483d40906. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEQ022011134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285de94e1ce997a3a8da30e2a50c7530f17026e320a2e234c35674ce486ebde3. 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/DEQ022114710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2470bdbf5af4207847b413fdcface7310f5bac027f14765c4233e87b18e92780. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QM3DF2280766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c83596240174fe5fdf5de853cec4abc0fb0223a003bf3c781fe3ad1a96fa8f. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/QZTBA2516645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c1a28b5661f3d9404598a55a70e9454b4f0da27ab418449177e2bffba3d5cd. 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/QT3FB2533777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9189b1dce499665ec32e598991184ec060c9fb27d9f994e3a052a8a5360f6153. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GB8KE1852038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b93390f95c88fc736e3ec9c3da6755b92a68dbb973ad7618c5f6f91fbec43b. 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/QZ8LD1728888.