Delta commonly refers to: Delta (letter) (Δ or δ), the fourth letter of the Greek alphabet D (NATO phonetic alphabet: "Delta"), the fourth letter in the Latin alphabet River delta, at a river mout
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 0x3a567e58fc6271cc7719362e5b4f7aeb38036a4759e32035fc7e2e8ef71947a3. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/daa3b234-0a6f-4484-8a00-bcf030aa8a62.json and https://artists.proofprofile.net/proofs/artist/daa3b234-0a6f-4484-8a00-bcf030aa8a62.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 0xebb707d691262146026328f2c39961a02b1f3302d05a188d49334085aa0e51e3. 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/ITIRH2400033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ec52226cc75532ccbe616a2fc6e011db8eb6312489615607a184d8a0ea18a5. 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/ITUC40000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90f6f7d96d3eb0150e1d7f3a2400850c876de441848c67021ea4f0056b4d26e. 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/ITUC40000042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e868f5ecba378e7365d49abb87345d79a3b9f425426f4ccc145e0a78f7945. 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/ITUC40000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf903a51b142d18b1c42b12a2e6154908a1846c78ef7ce0590b9bca1ba9e89ca. 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/ITUC40000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dd6aae15d397bd726d18572f592d4564492466c3e7cd3dbac0a7a883692d15c. 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/ITUC40000057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558dde54368736184bb5110127ec358937bc8fd817aec289953fd12380da2c11. 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/ITUC40000058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923c1a965cf9bbc445b37e73bc686a434d7ff1637d2b777532b68dce8fd4f0e6. 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/ITUC40000054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37abd080a5faadcbe1e965d338ebc44de21f3a73ad5e46ba82f661ef1f23c066. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:27:53Z), 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/ITUC40000059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c40adf68eb605d9a180488060e63f66264597c5654bfd22152bef97838a0d2e. 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/ITUC40000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b66380a60498d2773636ad11eca815e1f819547c8ad8d09cae51206f921827c. 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/ITUC40000060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ec52226cc75532ccbe616a2fc6e011db8eb6312489615607a184d8a0ea18a5. 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/ITUC40000031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485e868f5ecba378e7365d49abb87345d79a3b9f425426f4ccc145e0a78f7945. 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/ITUC40000034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97202e5ae04576db0a57d426b5beae0a9eddb7e2c0d613b2d02155752da8eb1. 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/ITI342200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4ec9a4d0af20020636a162477b5c595f03cbb75740cad7876f94fc21e9ecba. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ITUC40000053.
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 0x3635acf61d3235feb40fedc1892f83ddd625ca0af0aac122d25e37c56ebee83f. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ITUC40000056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88610d8f2bed1257073c34fb143ff1e1db8e605859f949bf6801fb99403eae70. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ITUC40000040.