thumb|Girl in a mourning dress holding a framed photograph of her father, who presumably died during the American Civil War thumb|Egyptian women in a sorrowful gesture of professional mourning thumb|I
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 0x52a2043cf05a08386a19f9c90eb479cacb41aa99783a977d5cbf20e36a0f4fc1. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2219864c-64bc-43c7-9ed4-ab5165bd9edd.json and https://artists.proofprofile.net/proofs/artist/2219864c-64bc-43c7-9ed4-ab5165bd9edd.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 0x74fa0b4b1112c1748117fb7bdf47a47d4366ed53dc464433fbc33f11a1c59453. 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/QZS7J2236192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b198db0202ee9fbec11fecdc3876d5b137634a792418eb53dcc61523a8aa12. 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/QZS7J2223244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542b29e5e54e89f3a841a9585bcdddb6505fc1b292f340b16f21e010d72c2ed3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZS7J2245449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee33428cca553bd2a6f4297bc157c662a0125c1a893e7e07a6c20fd9ce2b910. 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/QZHNB2144279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705aa706f80f122c11041edaeeed8d73de2c216bf01cffeb533d002e7412e178. 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/QZHNB2144281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aeb8709f40b78807a5a8917e67d2a1c192aa674048bf63ec5d93134ba2ecf3f. 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/QZHNB2144284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34271ef91350883ed1c58de7593cb57df23998729b17312c3b2d9926fefa31c. 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/QZDA71841291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d03f8e5955c3cc1717dbf1182d32366cc5f169412e6e5e0ce88ae83095fa7c2. 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/QZB4J1885418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93839f7cda10eac4b730d288f8a624f4f5aaa0d95ecabb758f2520e7984b7323. 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/QZHNB2144285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a27e969031dc57553033688db165effbb58d8b502de1eb8813786f7c285fdd. 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/QZHNB2144286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431737f5676340188d6ee31e0ed512e904f327cf62883e42d3ac0f00a3770fc9. 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/QZDA71841292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc670ad351d649c3ab3b3949adabcd4be893185b4f6a3992b480c918c7189aef4. 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/QZSYP2373680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3465f760911a4f4e5b7f5d9f69093121b2e4950c3aac21f2c49b717f99a1e366. 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/QZSYP2368955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191f8352bfad19b009590438f5369085d2fe88601e80bc73130e0786aa6f11b1. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SEYOK1945611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1daf4223c63a415a0dee7878101d093fb8bbb30ef0e372842f62059b484bef. 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/SEYOK1945612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c7aaa959d4937ded9257bc396f2fbb8bc207c162e5762bb9a07f3d4590012c. 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/TCAFA2048729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0721d99196f653f05a1cfe36a6465af34ea3eeb2f55ea79f0f39b4b73eed9263. 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/TCAFA2048735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c30712479d525e494825cdc3a4cabac887c43b239c933d4355c212a94cc7bef. 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/TCAFA2048738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7955246ea00473360e929173813d76773825525410f7ca02941d81b2e70071b. 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/TCAFA2048739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794c4591f6e255b7386c675a1f5e44325cde006fecc6aae95a01a1a4a94e3947. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCAFA2048740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e085f57ab64baaa3ffb323c341e4b55dd69513b310abf5b4a004068efac5cc. 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/TCAFA2048742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b72f3368ea9c292abdb4ee11619f17088ce969ed2266f7fd4774de0950a398. 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/TCAFA2048749.