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 0x4dce2c24f1ca2454be2bcdcaa4bdb97a60eda59bb6d2394d973adef93d463ab0. 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/4921d60a-82b2-4a7b-8644-e20d4fca1c0a.json and https://artists.proofprofile.net/proofs/artist/4921d60a-82b2-4a7b-8644-e20d4fca1c0a.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 0xb53cdd3a488a41e45e3dd596b86ee384315eb26f3538cdc4a9b25fb2e949d2f1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-20T12:04:28Z), 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/NLD321900670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa2b7bff9b8330fc2e3d893707dcbe0342935eba246a88a061ff76a57303eed. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/NLD321900832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa2b7bff9b8330fc2e3d893707dcbe0342935eba246a88a061ff76a57303eed. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/NLD321900832.
Once More, With Feeling (Feiertag Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6a91896f565b144e65e15bb8d5f7123e01962d2074351f3a8187ebfa329772. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NL5LG2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8baac3a0699d651b16981917b1c787ee5359066bc82178b757241d06e7a32b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NL5LG2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f485a3393946bbe2acc50ca5dcd63a8c79e81752264977a05d2b7031b05489. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:43:09Z), 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/NL5LG2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc86e8f3df542ab1c3461437f4347e3aa4af3b880f1690abba96b5caabd49c38. 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/NL5LG2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769851f40de934e870d38a58eb52331f997524bed891dfeb0353e5693221550a. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/NL5LG2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1391bb96c92f4e1ec9092174584cd23abe4a717c1e482a59886090c92768949. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NL5LG2200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefc37edb1f5bbe20374bdc6ed3e203078e4ae2c2957ec839e32fec60cce565b. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/NL5LG2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce230d1c9dc106085ffb380fde2598a49ce9bce805ee9d997505e572ca87ffc. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NL5LG2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca42d2ed49f023b397961fc1cea4f6475b57e3526e51316fe3371418ab182ca2. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/NL5LG2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x599ad0bf5880c636b46eec8d752dda282d1d630e5c47bbf4d2100a0240722f78. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/NLSB72100282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64ce75631ed4bcfebeb9321ea42f4180cc9e5da97ea21696218983e27344cea. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEN962232406.
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