thumb|A Eurasian siskin Spinus spinus giving 'siskin' calls thumb|A Eurasian siskin Spinus spinus The name siskin when referring to a bird is derived from an adaptation of the German dialect words sis
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 0x73a84d9e7476f7d114fe69a7569273f43d05ac52ef693b3653a92928bb542765. 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/421652b9-a34e-4aa5-bcba-517a60c4cb7d.json and https://artists.proofprofile.net/proofs/artist/421652b9-a34e-4aa5-bcba-517a60c4cb7d.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 0x8cf6b43781910d9a4bc67f069e3a52446946ab431c76b1ae38c9efc95ce75474. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:27:45Z), 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/NLC731900465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197f9bad79d60b8463c7e9adea3b849e80f0bbcf9a932d5c45d97f14da75592a. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-19T22:43:20Z), 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/NLE712100940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c5a16d54d104cfe6b9f7205c59abae6d03bc040f832e1c06154711e54f8b7e4. 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/NLE712200733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c8ff92255bcae453f8b4ec88e8b29298fd1fd92dfcc99828090598e3de83a9. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T16:01:49Z), 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/NLE712300221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0e4ed87e899f843f73e4701d20fd7ba422d482fa15995012365f95f7524bc9. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/NLE712300444.
Connected (Standard Form's Waiting for Stars Mix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a5e9915488e59551a7d7e61e6bc4ef8a18e44b0a0e25ac2b11cc9e2e0e113f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBKQU2431065.
Digitally Enhanced Volume Eight, mixed by Farius & Ruben de Ronde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0120dd8c2f75920dd6db0b2121d26867898d8205635ae2efc253689f9796d70. 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/GBKQU2396535.
FSOE882 - Future Sound Of Egypt Episode 882
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bda42286b22ae3ef6ce8a0420bd32e479cbd83a4f5e0f74b3e4b94c54649a3c. 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/UKRMQ2401335.
FSOE 819 - Future Sound Of Egypt Episode 819
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9671322dfdb82a0ecebc8682c0526286cda5e60b40b5de2fa3ebae7a47fe819c. 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/UKRMQ2300973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x183c7adc42b54393c4f372904e71b6e3bc5db4e2b4f16693beafd5bd0695a679. 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/GBLV62107401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15568acf54b3040e58f4a1d25c525b83ab84175a3eba6a90d27a0ca98e3a8828. 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/NLD682400116.
Light Up Love - Aion Flow Extended Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b47b5d9143c3f489f965a21094040cd22a293487dd2926f3ec7c263f804fdef. 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/NLD682400115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a416768aba262f33311ef63261f48fd0eb82da983fba39d6492ae2a95a15d2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBKQU2443582.
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 0x0a3b61a71b9633e7d07628eb6ce11e08e854ed52bcac9af540facd91095ebb78. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/NLD682401140.