A crossbreed is an organism with purebred parents of two different breeds, varieties, or populations. A domestic animal of unknown ancestry, where the breed status of only one parent or grandparent is
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 0xc3708529f8f792ec3efaf812d0a50f04b2744483c1d2c053008ec69d04c4c27c. 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/087260fb-a4e4-4c05-94c9-af04d415cc13.json and https://artists.proofprofile.net/proofs/artist/087260fb-a4e4-4c05-94c9-af04d415cc13.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 0xab8f210bd5cd05757d8484c9f41cd618271f77cfb32a537833d9d0b0d6040db4. 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/TCAGQ2255089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6a15d58728f67e8e51132e04e51a969a062d7d5e2cdce76db85a6f1696ccc6e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAGQ2255144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0378147b324c25c4e7d384a290df8277461298475d598e30babf2891cbf1b66. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:03:22Z), 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/TCAFP2146619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb528721016f21772b0dbda179808693249257b20e14b7a7241c8c363d339932. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAFP2146686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bc4b4ac125ca032bab671f5c9823a32d802b36f507d6708b4e4f6482bff8e9. 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/TCAFP2146298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dd65eaac6aad4ed12ed5f268178dabb564160e4701d08dad6fc0110777c688. 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/TCAFP2146400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a24c34a2a3e86e054bc391deec39f43b458e5c056cb545fc931ca63dad5a782. 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/TCAFP2146422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff05470c33ee479b2ba9fc2a6b2953e614f0ba1fc99c713bb70cc4cc4f72c05. 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/TCAFP2146429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e66a45e943ff07ab1f7a294aec467bc3b55a757bef1fc29c4c56a867630c2d. 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/TCAFP2146453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b354fae6d3f718a06acfe5e9bc871d4ed0912aa95a057f889d223eab7f2e0d9. 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/TCAFP2146470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9b29037790ccbae1b3c2269677a224f0c70c72e41f9e4d7091a6252b4ebc88. 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/TCAFP2146480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9cc202eb0aa026fd49b7ed9be254d688a05c9d99b095c8d31d6a54fc1062b2. 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/TCAFP2146500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c3183152e9c123ee0f4b7648219b2157bd9b6d2db465cb83c8a835c524e288. 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/TCAFP2146521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2ecef797a081c4c8d799de90dfea7ab6242f4982a5e405e046aa1860abfcc5. 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/TCAFP2146527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff33a3e2438339154d7afac3e628c3acb421bc270199012bc98c86638dffa67. 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/TCAFP2146543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57ba17ed9dd245220e433498038229564b305b65b009160fee1ce18e38c2664. 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/TCAFP2146549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2792a046f2ff44026e9224492c6ccb1b4a7e51387bd86831c572e2e215b0afc3. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCAIJ2464161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2254e128f7f00236a955b1ed37158752aed713c239edd99b6513fdf112bd570. 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/TCAGQ2253748.