Kosa may refer to: Places Kosa, Azerbaijan Kosa, Croatia, a village in Croatia Kōsa, Kumamoto, a town in Japan Kosa, Russia, several places with the name in Russia , a village in Bolhrad Raion,
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 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 0x84918443ea97e447dad0f7ecbab5bfcffe80a62003f7eb95f72afb8bd6f29004. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d1eb847-28fd-4790-b088-d5f9582f8915.json and https://artists.proofprofile.net/proofs/artist/9d1eb847-28fd-4790-b088-d5f9582f8915.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 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 0x8db7bb1fe3c212f3964a142669b12aeb02d72c2ab10795eb3a005137e2ac53bf. 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/CA5KR2117544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd696c6b8d627d3b2076b858b9e1d079c79c44ee5110723485dc8bff2fd3fd817. 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/PLV402301651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3d9c8b95d476a0a874820aaf0cf9afa8570da57a318c371e491d3c0f7bc410. 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/PLV402301637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e8e57912f1bbdccfc8a506d3561962410dda576130ded05bbc748efabb611f. 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/PLV402301638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623888c4ae1774e6f86093cd58486c996cf36105c1449e6d8d4c0e8f525397af. 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/PLV402301551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afe04a5241f95bfc0e3020a223fbba49eff2a0630b316de2b0cbf9025c8a557. 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/PLV402301650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9673a691974e0fe95f76e2557a0b1cf1aef44cfb37bca9a9d5cf95cfb2c81774. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLV402301636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08de7926996bf208c7e563460942af31103a635c1a8b0093aa0e030c73aa9e0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR96X2396809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9dc8b1c3843cdecfb154dd4cf4ae8700a4ccc2728bee992236678c49b846092. 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/PLV402301639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7334a686c0564c82b9e9132d50b41664f01687a9739cdb0169baffa9464f6b. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/PLV402301640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be2f54034cc3d294a2eecc27c9f35df300aa8cf6f36613985572618dc50ce36. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLV402201678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605e3500f6b52de8adf1d1d543004bf70df693ffe262c0927a80026055592d10. 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/PLV402301642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e318293f9b33b2f5783498a1a842aa6797a31b6bc49480c4b9a32839cd4b3e1. 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/PLV402301643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a442bb21a537694e9db4259cc174fa813a2e8b53d6461bc9a34780db817e07f. 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/PLV402301644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d581788fd723f5059f84c00dd6abc07cf0cb2950754022c30c97dec19666a46. 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/PLV402301645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73fe8eeebdd4d6e36a7fb20d5e9c6cd5b4823d84098ab32b93d858342d3eb981. 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/PLV402301646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ab1600facb6976d396e26e31cc61d6a35ff8444c70cb68f1a130d0af987f24. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/PLV402301647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fdd16bbb04a10c69810dcab8b7eb053ad20e653d4ff36ac2ad45e02bb1c973. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PL2DY2302190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349d2c20c4d75266c6d97a9754948d55ad08a138d92c1bb69b628ea6e51b0a56. 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/PLX632100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74e3c025295322f2b0ce611e0e85ec563efc7fa4626330e8d06c9b730f7b4deb. 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/PLX632100015.