In mathematics, a function space is a set of functions between two fixed sets. Often, the domain and/or codomain will have additional structure which is inherited by the function space. For example, t
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb973e5a4dd0f764224ccc693cc95642b7694e068a8951fa0ed1664a07b4c2c57. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4aa9269-64e4-4918-ab51-6412fa199869.json and https://artists.proofprofile.net/proofs/artist/b4aa9269-64e4-4918-ab51-6412fa199869.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7519e82a754e49087690ab0a86ac73abb30f3658f8d5571183c6b7896479f1e9. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAEE1988565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2bbad9cdc8d4c7479daf417198192beb7dda9c7d05cdd1df78ff03539f9d43. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAEJ1928025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c55b0cf8d15bbfa534c6ce553213f18084975b5cc530c351f50ac01d1eeebf1. 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/TCAEL1969774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc30fc161340e802dabdfa3420958ee5542c4177112b54b313deb1e25d7dee5d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAEG1942895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f89312fd636cda0469ff70ab9a2a85cdb3ed1f91662380f7ac0bed304d6e8b2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEC1956315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e6d6670a3708246688c4a718857894742ffdb90087858f5164275df521bbb0. 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/TCAIJ2494753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06478c30ad607196bfe46540db2a78d7ac34ac5ce0e7206bf33156dca1172f78. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAIF2474118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x761786e8e7823176f07488e89b10aa85eefa0fb5544a61979635bf9211a804ad. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/TCAGP2258069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736b6620bf03194dbe0fb36275395d462361c3c76282ee965db5294b15f31567. 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/TCAGF2268132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58f090363e5e9d55ee606878201bfc2ef6d82331506f0bf27fcddaf8f2fe3445. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFP2110415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c55b0cf8d15bbfa534c6ce553213f18084975b5cc530c351f50ac01d1eeebf1. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/TCAEL1969774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2bbad9cdc8d4c7479daf417198192beb7dda9c7d05cdd1df78ff03539f9d43. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAEJ1928025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc30fc161340e802dabdfa3420958ee5542c4177112b54b313deb1e25d7dee5d. 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/TCAEG1942895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7519e82a754e49087690ab0a86ac73abb30f3658f8d5571183c6b7896479f1e9. 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/TCAEE1988565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f89312fd636cda0469ff70ab9a2a85cdb3ed1f91662380f7ac0bed304d6e8b2. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/TCAEC1956315.